A rose, say, worker planted in row (9)
I believe the answer is:
eglantine
'a rose' is the definition.
(eglantine is a kind of rose)
'say worker planted in row' is the wordplay.
'say' becomes 'eg'.
'worker' becomes 'ant' (worker is a type of ant).
'planted in' is an insertion indicator.
'row' becomes 'line' (I've seen this before).
'ant' put within 'line' is 'lantine'.
'eg'+'lantine'='EGLANTINE'
(Other definitions for eglantine that I've seen before include "Strangely inelegant scented plant" , "Inelegant (anag.); wild rose" , "Wild rose, sweet briar" , "Milton's honeysuckle" , "Rose, growing wild" .)