Rose, say, in front of worker in queue (9)
I believe the answer is:
eglantine
'rose' is the definition.
(eglantine is a kind of rose)
'say in front of worker in queue' is the wordplay.
'say' becomes 'eg'.
'in front of' means one lot of letters go next to another.
'worker' becomes 'ant' (worker is a type of ant).
'in' is an insertion indicator.
'queue' becomes 'line' (I've seen this before).
'ant' going inside 'line' is 'lantine'.
'eg'+'lantine'='EGLANTINE'
(Other definitions for eglantine that I've seen before include "Sweet brier" , "Sweetbriar, inelegant in a way" , "Wild rose, sweet briar" , "Strangely inelegant scented plant" , "Inelegant (anag) - plant" .)