Mostly leave out nuts to make eggs (7)
I believe the answer is:
ovulate
'make eggs' is the definition.
(I've seen this in another clue)
'mostly leave out nuts' is the wordplay.
'mostly' means to remove the last letter.
'nuts' is an anagram indicator (nuts can mean crazy).
'leave' with its last letter taken away is 'leav'.
'leav'+'out'='leavout'
'leavout' with letters rearranged gives 'OVULATE'.
'to' is the link.
(Other definitions for ovulate that I've seen before include "supply eggs" , "Produce eggs" , "Discharge female germ cells" .)