Crossword Genius

Stubborn, small pet (5)

Ross

I believe the answer is:

stiff

'stubborn' is the definition.
(thesaurus)

'small pet' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'pet' becomes 'tiff' (I've seen this before).
's'+'tiff'='STIFF'

(Other definitions for stiff that I've seen before include "Rigid, unbending", "cheat", "Unyielding", "Formal", "Awkward".)

I've seen this clue in The Telegraph.
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