One spawned by former partner (7)
I believe the answer is:
oldwife
'one spawned' is the definition.
(type of fish, so something 'spawned')
'by former partner' is the wordplay.
'by' says to put letters next to each other.
'former' becomes 'old' (I've seen this before).
'partner' becomes 'wife' (wife is a kind of partner**).
'old' next to 'wife' is 'OLDWIFE'.
I've seen this clue in The Independent.
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