Frosty setter I start to dislike (5)
I believe the answer is:
gelid
'frosty' is the definition.
(I've seen this in another clue)
'setter i start to dislike' is the wordplay.
'setter' becomes 'gel' (something which sets).
'start to' says to take the initial letters.
The initial letter of 'dislike' is 'd'.
'gel'+'i'+'d'='GELID'
(Other definitions for gelid that I've seen before include "Extremely cold, frozen" , "Icy cold - glide (anag)" , "Glacial" .)