A cover gardener finally brought in to treat flower (6,4)
I believe the answer is:
damask rose
'flower' is the definition.
(I've seen this before)
'a cover gardener finally brought in to treat' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'cover' could be 'mask' (masking is a kind of covering) and 'mask' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for damask rose that I've seen before include "Sweet-scented flower yielding attar" , "bloomer" , "source of attar" , "hardy flower" .)