Squirrel's find (5)
I believe the answer is:
acorn
'squirrel's find' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for acorn that I've seen before include "mast" , "Might source" , "from which something bigger may develop" , "From which a "tall oak" may grow" , "form of seeding" .)