Licensed vagrant goes downhill (8)
I believe the answer is:
declines
'goes downhill' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how they can define each other.
'licensed vagrant' is the wordplay.
'vagrant' is an anagram indicator (vagrant can mean wandering around).
'licensed' anagrammed gives 'DECLINES'.
Can you help me to learn more?
(Other definitions for declines that I've seen before include "Gradually decreases" , "Silenced in descents" , "Refuses to be silenced" .)