Throw Lamb a flower (7)
I believe the answer is:
lobelia
'a flower' is the definition.
(I've seen this before)
'throw lamb' is the wordplay.
'throw' becomes 'lob' (lobbing is a kind of throwing).
'lamb' becomes 'elia' (pseudonym of essayist Charles Lamb).
'lob'+'elia'='LOBELIA'
(Other definitions for lobelia that I've seen before include "Oilable (anag)" , "Herbaceous plant - boil ale (anag)" , "Five-lobed flower" , "Common garden plant; oil bale (anag.)" , "Showy garden flower" .)