Nuts make birds land (9)
I believe the answer is:
disembark
'land' is the definition.
(disembarking is a kind of landing)
'nuts make birds' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'make'+'birds'='makebirds'
'makebirds' with letters rearranged gives 'DISEMBARK'.
(Other definitions for disembark that I've seen before include "Step on dry land" , "to set oneself apart from trader, say" , "Get off" , "Go ashore" .)