Leaders in race on Arctic trek caught by your old husky (7)
I believe the answer is:
throaty
'husky' is the definition.
(thesaurus)
'leaders in race on arctic trek caught by your old' is the wordplay.
'leaders in' suggests taking the first letters.
'caught by' indicates putting letters inside.
'your old' becomes 'thy'.
The initial letters of 'race on arctic trek' is 'roat'.
'roat' put inside 'thy' is 'THROATY'.
(Other definitions for throaty that I've seen before include "roughly speaking" , "(Of voice) deep, husky" , "Like Hacker, maybe" , "Hoarse" .)