Crossword Genius

Plant carbon copy, one couple don’t want (4,10)

Ross

I believe the answer is:

cape gooseberry

'plant' is the definition.
(cape gooseberry is a kind of plant)

'carbon copy one couple don't want' is the wordplay.
'carbon' becomes 'C' (chemical symbol).
'copy' becomes 'ape' (ape can mean to copy or imitate).
'one couple don't want' becomes 'gooseberry' (gooseberry can mean an extra person with a couple).
'c'+'ape'+'gooseberry'='CAPE GOOSEBERRY'

I've seen this clue in The Times.
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