Labours small records (5)
I believe the answer is:
slogs
'labours' is the definition.
(both can mean to work hard)
'small records' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'records' becomes 'logs' (log is a kind of record).
's'+'logs'='SLOGS'
I've seen this clue in The Guardian.
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