They saw where a fish comes in (10)

I believe the answer is:

carpenters

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'they saw' is the definition.
Although both the answer and 'saw' are verbs, they are not in the same form of the verb.

'a fish comes in' is the wordplay.
'a fish' becomes 'carp' (carp is a kind of fish).
'comes in' becomes 'enters' ('enter' can be a synonym of 'come in').
'carp'+'enters'='CARPENTERS'

'where' is the link.

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I've seen this clue in The Globe and Mail.

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