Better without clothing for race, one would agree? (8)
I believe the answer is:
streaker
'one would agree?' is the definition.
I can't judge whether this defines the answer.
'better without clothing for race' is the wordplay.
'better' becomes 'staker' (someone betting a stake).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'clothing for' suggests removing the centre (only the letters which clothe the word).
'race' with its centre removed is 're'.
'staker' placed around 're' is 'STREAKER'.
(Other definitions for streaker that I've seen before include "A naughtily nude runner (8)." , "Naked runner" , "Exhibitionist spectator" , "One can run fast" , "Person who runs naked through a public place" .)