Predecessor can store nuts (8)
I believe the answer is:
ancestor
'predecessor' is the definition.
(I've seen this before)
'can store nuts' is the wordplay.
'nuts' indicates an anagram (nuts can mean crazy).
'can'+'store'='canstore'
'canstore' is an anagram of 'ANCESTOR'.
(Other definitions for ancestor that I've seen before include "descent comes from one" , "Enactors (anag)" , "Predecessor" , "One of one's forebears" , "Person from whom one is descended" .)