The overgrown boy continues to be resented (7)
I believe the answer is:
rankles
'continues to be resented' is the definition.
I can't judge whether this defines the answer.
'the overgrown boy' is the wordplay.
'the overgrown' becomes 'rank' (I've seen this in another clue).
'boy' becomes 'Les' (short for Leslie).
'rank'+'les'='RANKLES'
Can you help me to learn more?
(Other definitions for rankles that I've seen before include "Goes on vexing" , "Continues to hurt" , "Riles" , "Causes lasting and bitter annoyance" .)