Back to play on that (3)
I believe the answer is:
yon
'that' is the definition.
(archaic term meaning 'that')
'back to play on' is the wordplay.
'back to' suggests the final letters.
The final letter of 'play' is 'y'.
'y'+'on'='YON'
(Another definition for yon that I've seen is " Those Scots".)
I've seen this clue in the Sydney Morning Herald.
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