ACROSS
9 Vessel is kept wrong way up in cover following instructions basically (7) ICEBOAT {C{BE<=}OAT}<=>{In...s}
10 Bar stocking some rum portion (7) EXCERPT {EXCE{Rum}EPT}
11 Disturbances in old city after female destroys rose (7) FURORES {UR}<=>{F} and {ROSE}*
12 General devastated by blow up (7) ENLARGE*
13 Tries internally, from the heart in practice (9) REHEARSAL {RE{HEARS}AL}
15 Crude people try taking the short recourses at the end (5) GOTHS {GO}{THe}{r...eS}
16 Fibre strands kept in loops outside old cover essentially (7) ROVINGS {R{O}{coVer}INGS}
19 Obsolete record for the most part at America's erased, emptied (7) DISUSED {DISc}{US}{Er...eD}
20 Plant sap secured from hollow tree in general (5) LATEX {LA{TreE}X}
21 Vocalists in a whirl snort some ganja, ecstasy on board (9) SONGSTERS {SNORT+Ganja+E}* in {SS}
25 Author told 'Finish off story without reading' (7) TOLSTOY {TOLd}{STOtY}
26 Approaches girl to replace union leader and gets even with (7) AVENGES AVEN(-u+g)GES
28 Issue coming back at head office with directions to absentees (2-5) NO-SHOWS {SON<=}{HO}{W}{S}
29 Permit insurers to collect no charge after preliminary examination online (7) LICENCE {LIC}{E}{NC}{E}
DOWN
1 File destroyed in Puerto Rico by snitch (6) PILFER {P{FILE*}R}
2 Explore Bay of Bengal perhaps, right with two leaders from Chennai (6) SEARCH {SEA}{R}{CHe...i}
3 Unit to primarily record resistance (4) TORR {TO}{Re...d}{R}
4 So, tips getting damaged leads to drooping of eyelids (6) PTOSIS*
5 Cot is placed across improper level and slanted (8) BEVELLED {BE{LEVEL*}D}
6 Say, greens have E.Coli mostly, sis got affected (10) ECOLOGISTS {ECOLi}{SIS+GOT}*
7 Issues with expert's rank (second) (8) PRORATES {PRO}{RATE}{S}
8 Emphasised lock to be kept in empty safe by guard at the end (8) STRESSED {Sa{TRESS}fE}{g..rD}
14 Princess's tax return is primarily zero. Normal to take over? (10) ANNEXATION {ANNE}{TAX<=}{Is}{O}{N}
16 Reporting about story in organization (8) RELATING {R{TALE<=}ING}
17 Doctrine of relativism rewritten, about to be released (8) VITALISM reLATIVISM*
18 Sister is shy, silly and cowardly (8) SISSYISH {SIS+IS+SHY}*
22 Almost new and advanced (6) NEARLY {N}{EARLY}
23 Brussels has company at northeast - a US city (6) EUGENE {EU}{GE}{NE}
24 British special regiment saves woman from belts (6) SASHES {SA{SHE}S}
27 Every electronic account's hacked primarily (4) EACH {E}{AC}{Ha...d}
Reference List
Old city = UR, Female = F, Old = O, Ecstasy = E, Reading = R, Girl = G, Union = U, Head office = HO, Right = R, Resistance = R, Second = S, Normal = N, About = RE, New = N, Brussels = EU, Company = GE, Northeast = NE, British Special Regiment = SAS, Electronic = E, Account = AC