A couple on watch? (4)

I believe the answer is:

dial

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'watch?' is the definition.
(thesaurus)

'a couple on' is the wordplay.
'couple' becomes 'dil' (I can't justify this - if you can you should believe this answer much more).
'on' is an insertion indicator (as in clothing 'on' a person).
'a' put inside 'dil' is 'DIAL'.

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(Other definitions for dial that I've seen before include "feature of old phone?" , "Indicator" , "Calibrated face" , "Face of a timepiece" , "Face with numbers" .)

I've seen this clue in the Evening Standard.

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