Not all bits of blossom everywhere (4)
I believe the answer is:
some
'not all' is the definition.
(I know this)
'bits of blossom everywhere' is the wordplay.
'bits of' indicates the answer is hidden within the clue.
'SOME' is hidden within 'blossom everywhere'.
(Other definitions for some that I've seen before include "An undetermined number" , "Hard work" , "A little; not a little" , "An unspecified quantity, not all" , "Several" .)