We rang about a rodent (6)

I believe the answer is:

gnawer

'a rodent' is the definition.
('gnawer' can be a synonym of 'rodent')

'we rang about' is the wordplay.
'about' is an anagram indicator.
'we'+'rang'='werang'
'werang' anagrammed gives 'GNAWER'.

I've seen this clue in The Guardian.

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