Go near rotting fruit (6)
I believe the answer is:
orange
'fruit' is the definition.
(orange is a kind of fruit)
'go near rotting' is the wordplay.
'rotting' indicates anagramming the letters.
'go'+'near'='gonear'
'gonear' anagrammed gives 'ORANGE'.
(Other definitions for orange that I've seen before include "Onager (anag.)" , "Between red and yellow on the spectrum" , "shade" , "Colour between red and yellow" , "Loyalist colour" .)