Sour fruit contributed by mother and child (6)
I believe the answer is:
damson
'sour fruit contributed' is the definition.
I can't judge whether this defines the answer.
'mother and child' is the wordplay.
'mother' becomes 'dam' (female parent of an animal).
'and' is a charade indicator (letters next to each other).
'child' becomes 'son' (male child).
'dam'+'son'='DAMSON'
'by' acts as a link.
Can you help me to learn more?
(Other definitions for damson that I've seen before include "Kind of plum for nomads" , "Small stone-fruit for nomads" , "Plum-coloured" , "Type of plum" , "Small tart plum" .)