Mother and boy to get fruit (6)
I believe the answer is:
damson
'fruit' is the definition.
(damson is a kind of fruit)
'mother and boy' is the wordplay.
'mother' becomes 'dam' (female parent of an animal).
'and' says to put letters next to each other.
'boy' becomes 'son' (synonyms).
'dam'+'son'='DAMSON'
'to get' acts as a link.
(Other definitions for damson that I've seen before include "Dark purple plum" , "Nomads (anag)" , "Small plum-like fruit" , "fruit tree" , "Type of plum" .)