Mole excited by new fruit (5)
I believe the answer is:
melon
'fruit' is the definition.
(type of fruit)
'mole excited by new' is the wordplay.
'excited' indicates an anagram.
'by' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'mole' anagrammed gives 'melo'.
'melo'+'n'='MELON'
(Other definitions for melon that I've seen before include "Type of pepo" , "Fruit - lemon (anag)" , "Killing" , "Cantaloupe fruit" , "I'm very seedy" .)