The girl's in second service, dazzling people (8)
I believe the answer is:
smashers
'dazzling people' is the definition.
(smasher can mean an attractive person)
'the girl's in second service' is the wordplay.
'the girl's' becomes 'her' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'second' becomes 's' (common abbreviation).
'service' becomes 'mass' (kind of church service).
's'+'mass'='smass'
'her' going inside 'smass' is 'SMASHERS'.
(Other definitions for smashers that I've seen before include "that look lovely?" , "Informally, good-looking women - sound destructive" , "People having big hits" , "Breakers of things - or, informally, very good-looking women" .)