Crossword Genius

The cat gets us more upset (6)

Ross

I believe the answer is:

mouser

'the cat' is the definition.
(mouser is a kind of cat)

'us more upset' is the wordplay.
'upset' indicates anagramming the letters.
'us'+'more'='usmore'
'usmore' with letters rearranged gives 'MOUSER'.

'gets' acts as a link.

(Other definitions for mouser that I've seen before include "Rodent catcher" , "Cat with certain skills" , "Predatory cat" , "Cat that's good at catching small rodents" , "One getting rid of vermin" .)

I've seen this clue in the Evening Standard.
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