Watches male involved in rows (6)
I believe the answer is:
timers
'watches' is the definition.
'male involved in rows' is the wordplay.
'male' becomes 'm' (common abbreviation).
'involved in' indicates putting letters inside.
'rows' becomes 'tiers' (tier is a kind of row).
'm' placed within 'tiers' is 'TIMERS'.
(Another definition for timers that I've seen is " Measuring devices (often old?)".)
I've seen this clue in The Telegraph.
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