Flannel enclosing cold flower (9)
I believe the answer is:
buttercup
'flower' is the definition.
(I've seen this before)
'flannel enclosing cold' is the wordplay.
'flannel' becomes 'butterup' (to flannel can mean to flatter or butter up).
'enclosing' indicates putting letters inside.
'cold' becomes 'C' (eg on taps).
'butterup' going around 'c' is 'BUTTERCUP'.
(Other definitions for buttercup that I've seen before include "Bumboat woman" , "Bright yellow flower" , "Common grassland plant, poisonous to livestock" , "weedy type" , "found in meadow" .)