No 9494, Tuesday, 31 Mar 09, Nita Jaggi

Somehow I did not like todays CW as such I have some unsolved, some of the clues were not good at all in terms of the wordplay. (Addendum - adding the unsolved)
ACROSS
4 - Cheers for the primate covering a mountain resort in America (8) – AP{PLA<-}{US}E
8 - Girl knocked out, in coma (6) – MONICA*
9 - Walker at a street crossing (10) – PEDESTRIAN [2]
10 - Suitable to pull apart the layer (4) – (Addendum - RIP{E})
11 - Start off to crop areas of body parts (4) – (-f)ARMS
13 - One is extremely prone to illness (6) – UN{WELL} Not a very good clue
15 - Former partner has damaged the meter to the limit (7) – EX{TREME}*
17 - Almost call the man without motion (4) – CAL(-l)M
18 - Slow kind of birds! (4) – OWLS*
19 - Attack us, alas to cause damage on Tuesday (7) – ASSAUL*{T}
21 - Mother around the social worker reading the holy word (6) – M{ANT}{R}A
22 - Like one road in the continent (4) – AS{IA}
25 - Large snake on the river animal (4) – BOA{R}
26 - Short message in a book for a friend (10) - DEDICATION [CD]
27 - Sculpture of iron turned back for a small illustration at the end of the day (6) – EF<-{FIG}Y
28 - Never defeated the knight to live at a point in United Nations (8) – U{N}{BE}{AT}{E}N
DOWN
1 - Fashionable vehicles overturned (5) – SMART<-
2 - Partnership at lunchtime for each shooter (6) - (Addendum - SN{I}PER SN is the partnership from Bridge)
3 - Army comes up through the dim light (5) – TA{PER} ?
4 - Sedan sped by the mountain range (5) – ANDES*
5 - Time gone by the river grass land (7) – PAST{URE}
6 - Plant a sign on an open way for the audience (9) – ARROW{ROOT} How is Root connected to audience I wonder if the setter has used audience to indicate a homophone for Root (~route)
7 - Make an informal conversation to kill time (5,4) – SMALL TALK [CD]
12 - Set up a smart establishment (5) – MARTS*
14 - Emperor has a point before an operation (9) - CAESAR{E}AN
15 - Half of them take the way that is easy at the beginning to understand (9) - (-th)EM{PATH}ISE (is easy - asy) Word play not good here
16 - Ways to earn wealth (5) – MEANS [2]
19 - First man and the worker are not flexible (7) - ADAM{ANT}
20 - Gain power for taking up Information Technology (6) – P{ROF<-}IT
22 - Reorient one shipping company in a sound way (5) – A{LIGN} (~line)
23 - Hidden feeling for the local king (5) – INN{ER} Annotation for ER not clear
24 - Carriers of light beams (5) – T{RAYS}