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On return, keep catching fish — in this? (7)

Ross

I believe the answer is:

dragnet

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'this?' is the definition.
The definition suggests a singular noun which matches the answer.

'on return keep catching fish' is the wordplay.
'on return' is a reversal indicator.
'keep' becomes 'tend'.
'catching' is an insertion indicator.
'fish' becomes 'gar' (gar is a kind of fish).
'tend' going around 'gar' is 'tengard'.
'tengard' written backwards gives 'DRAGNET'.

'in' is the link.

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(Other definitions for dragnet that I've seen before include "Granted, this may be an organised system of gathering in" , "hunt for suspect" , "Mesh drawn across river to catch fish" , "Comprehensive search" , "Systematic police search for wanted person" .)

I've seen this clue in The Times.
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