Crossword Genius

What Rose may do, or cat? Not half! (3)

Ross

I believe the answer is:

jag

'what rose may do' is the definition.
(the thorns on a rose might jag someone)

'cat? not half' is the wordplay.
'cat?' becomes 'jaguar' (jaguar is a kind of cat).
'not half' means to take half the letters.
'jaguar' halved is 'JAG'.

'or' acts as a link.

(Another definition for jag that I've seen is " Cut unevenly; drinking bout".)

I've seen this clue in The Times.
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