Crossword Genius

Nasty rat is moving around (5)

Ross

I believe the answer is:

astir

'moving around' is the definition.
(I've seen this in another clue)

'nasty rat is' is the wordplay.
'nasty' indicates an anagram.
'rat'+'is'='ratis'
'ratis' is an anagram of 'ASTIR'.

(Other definitions for astir that I've seen before include "Excitedly moving" , "Moving; out of bed" , "This isn't still" , "In motion - out of bed" , "Up and about -- is art (anag)" .)

I've seen this clue in The Sun.
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