Flower child initially wrapped in flannel (9)
I believe the answer is:
buttercup
'flower' is the definition.
(thesaurus)
'child initially wrapped in flannel' is the wordplay.
'initially' indicates taking the first letters.
'wrapped in' is an insertion indicator.
'flannel' becomes 'butterup' (to flannel can mean to flatter or butter up).
The initial letter of 'child' is 'c'.
'c' put into 'butterup' is 'BUTTERCUP'.
(Other definitions for buttercup that I've seen before include "Common yellow flower" , "Bumboat woman" , "Bright yellow flower" , "found in meadow" , "Common yellow meadow plant" .)