A cereal crop and fruit from a tree (5)
I believe the answer is:
acorn
'fruit from a tree' is the definition.
'acorn' can be an answer for 'fruit' (acorn is a kind of fruit). I'm not sure about the 'from a tree' bit.
'a cereal crop and' is the wordplay.
'cereal' becomes 'corn' (corn is a kind of cereal).
'crop' means to remove the last letter.
'and' becomes 'n' (common abbreviation for 'and').
'corn' with its last letter removed is 'cor'.
'a'+'cor'+'n'='ACORN'
Can you help me to learn more?
(Other definitions for acorn that I've seen before include "from which something bigger may develop" , "Fruit-seed of the oak" , "Nut of oak tree" , "mast" , "old computer?" .)