No. 11147, Saturday, 26 July 2014. Afterdark

Standing in for Bhavan this morning, I had an engaging time with this crossword.
To make this post participatory, I am leaving some  clues (answers provided) to be annotated by my readers. One visitor, one anno, please.
In Clue 24dn, Afterdark does a 'lift and separate' on his name. Hope he has pulled himself together now.

ACROSS
1    Prompting to include five top educators for research... (13) INVESTIGATION  - insertion of  V E in INSTIGATION
10    …one saw joy in trouble? No chance in hell (2,3,4) NO WAY JOSE - anag. of ONESAWJOY
11    Mention about accepting Head Honcho's principles (5) ETHIC - insertion of H in ETIC (rev. of cite)
12    Lie about crackhead's passion (5) CHEAT - cha. of C HEAT

                                                                        Cartoon by Rishi

13    Changes model's right replies from woman to female (9) TRANSFERS - cha. T R ANS(-w+F)ERS
14    Domain of Samajwadi Party leaders in this stage (6) SPHERE cha. SP HERE
16    Worry about having no currency? (4) EURO - cha. of EUR (rev. of RUE) O
19    Say, a mammal left you in the past (4) ONCE - deletion  O(-u)NCE
20    Reasonable to deny credit for eatable (6) EDIBLE - deletion  (cr)EDIT
25    Begged to stop including surprise elements, for starters (9) ENTREATED - anno. to be provided by any reader :: (Since attempted; see Comments)
26    Lived with newlywed first lady over time (5) DWELT - cha. of DWE (anag, of WED) L T
27    Star Sapphire recreated, perhaps out of bones (5) TARSI - anno. to be provided by any reader :: (Since attempted; see Comments)
28    Since tail was operated, it's rigid (9) INELASTIC - anag. of SINCETAIL

29    Lament about strange scrooge's integration in group of companies (13) CONGLOMERATES  - anno. to be provided by any reader :: (Since attempted; see Comments)

DOWN
2    Capital in a modern and ancient Greek town without a leader of people (3,5) NEW DELHI - cha. of NEW DEL[p]HI
3    Wrongly type to include girl’s country (5) EGYPT - insertion of G in EYPT (anag. of type)
4    Fish tourist cooked without iodine (6) TROUTS - anag. of TOUR[i]ST after deleting I
5    Explosives danger quashed by Emergency Services (8) GRENADES - cha. of GRENAD (anag. of danger), E S
6    Having assessed, trustee replaced headmaster who was revered (9) TREASURED - anno. to be provided by any reader :: (Since attempted; see Comments)
7    Atrociously overcharges the grave dug out for earth pigments (6) OCHRES- anno. to be provided by any reader :: (Since attempted; see Comments)
8    Broken casks had new refreshments (6) SNACKS - insertion of N in SACKS ( anag. of casks)
9    Digital money exchanged initially by accountant silently (1-4) E-CASH - cha. of E CA SH
15    In other words, outfight the drunk Engine Driver's performance (9) RENDERING - anno. to be provided by any reader :: (Since attempted; see Comments)
17    Routine arrangement to get nuclear particle (8) NEUTRINO - N (nuclear) in NEUTRIO (anag of ROUTINE)
18    Engineer joined new senate, but he didn't attend (8) ABSENTEE- anno. to be provided by any reader :: (Since attempted; see Comments)
21    Draw a crumpled necktie with first knot loose (6) ENTICE - anag. of NECTIE after deleting K from necktie
22    City harbour replaced British chief with Portugal's (5) PERTH - sub. of P for B in BERTH
23    Sound equipment set dismantled again by the Disc (6) STEREO - cha of STE(anag. of SET) RE O
24    Affix After Dark's initials in this place (6) ADHERE - cha. of  A D here

                                            Cartoon by Bhargav

26    Play medico went with wet nurse lacks finish (5) DRAMA -  cha. of DR AMA[h]