Here most trouble may be forgotten by convalescents (4,4)
I believe the answer is:
rest home
'be forgotten by convalescents' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'here most trouble' is the wordplay.
'trouble' is an anagram indicator.
'here'+'most'='heremost'
'heremost' with letters rearranged gives 'REST-HOME'.
'may' is the link.
Can you help me to learn more?
(Other definitions for rest home that I've seen before include "old institution" , "place for the frail elderly" , "residence" , "place to stay" , "Place for the old" .)