He roars with difficulty, becoming more husky (7)
I believe the answer is:
hoarser
'more husky' is the definition.
(I've seen this before)
'he roars with difficulty' is the wordplay.
'with difficulty' indicates an anagram.
'he'+'roars'='heroars'
'heroars' is an anagram of 'HOARSER'.
'becoming' acts as a link.
(Other definitions for hoarser that I've seen before include "More husky" , "Rougher-sounding" .)