Like a lucky clover (4-4)
I believe the answer is:
four-leaf
'like a lucky clover' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for four-leaf that I've seen before include "This clover is considered lucky" , "This clover is said to be lucky" , "'I'm looking over a . . . . . . . . clover' (song)" .)