Live with Grand Final challenge (5)
I believe the answer is:
beard
'challenge' is the definition.
(thesaurus)
'live with grand final' is the wordplay.
'live with' becomes 'bear' (I've seen this before).
'final' says to take the final letters.
The final letter of 'grand' is 'd'.
'bear'+'d'='BEARD'
(Other definitions for beard that I've seen before include "Vandyke, perhaps" , "Hair on the chin" , "Whiskers" , "Goatee, for instance" , "Facial feature" .)