Crossword Genius

Something in sewer forced rats into clothing store (3,4)

Ross

I believe the answer is:

gas trap

'something in sewer' is the definition.
(a sewer might contain a gas trap)

'forced rats into clothing store' is the wordplay.
'forced' indicates an anagram.
'into' is an insertion indicator.
'clothing store' becomes 'gap' (GAP is a UK clothing store).
'rats' with letters rearranged gives 'astr'.
'astr' going within 'gap' is 'GAS-TRAP'.

I've seen this clue in The Independent.
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