Bird eggs on some flowers (9)
I believe the answer is:
larkspurs
'some flowers' is the definition.
(larkspur is a kind of flower)
'bird eggs on' is the wordplay.
'bird' becomes 'lark' (lark is a kind of bird).
'eggs on' becomes 'spurs' (I've seen this in another clue).
'lark'+'spurs'='LARKSPURS'
(Other definitions for larkspurs that I've seen before include "Common names for delphiniums" , "bloomers" .)