Crossword Genius

Rodent's sin: entering waste flow (5,3)

Ross

I believe the answer is:

sewer rat

'rodent's' is the definition.
(sewer rat is a kind of rodent)

'sin entering waste flow' is the wordplay.
'sin' becomes 'err' (to sin is to err morally).
'entering' is an insertion indicator.
'flow' is an anagram indicator (to flow can mean to move around).
'waste' anagrammed gives 'sewat'.
'err' going inside 'sewat' is 'SEWER-RAT'.

(Another definition for sewer rat that I've seen is " Brown rodent".)

I've seen this clue in The Guardian.
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