Sour fruit, half of plum eaten by two animals (4-5)

'sour fruit' is the definition.
(I've seen this before)

'half of plum eaten by two animals' is the wordplay.
'two animals' means two replacements for 'animal'.
'half of' suggests halving the letters.
'eaten by' indicates putting letters inside.
'animal' becomes 'crab'.
'animal' becomes 'ape'.
'plum' with half the letters taken is 'pl'.
'crab'+'ape'='crabape'
'pl' inserted inside 'crabape' is 'CRAB-APPLE'.