Doing well, solve clues and cuss if one's missed (10)
I believe the answer is:
successful
'doing well' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'solve clues and cuss if one's missed' is the wordplay.
'solve' is an anagram indicator (I've seen 'solved' mean this (the anagram must be solved)).
'and' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'missed' suggests deleting specific letters.
'clues'+'cuss'+'if'='cluescussif'
'cluescussif' with 'i' taken away is 'cluescussf'.
'cluescussf' anagrammed gives 'SUCCESSFUL'.
Can you help me to learn more?
(Other definitions for successful that I've seen before include "achieving aim" , "Winning; flourishing" , "Prosperous" .)