Perform for that misguided brute Thomas! (7)
I believe the answer is:
doubter
'thomas' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?
'perform for that misguided brute' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'for' is a charade indicator (letters next to each other).
'that misguided' indicates anagramming the letters (I've seen this in other clues).
'brute' is an anagram of 'ubter'.
'do'+'ubter'='DOUBTER'
Can you help me to learn more?
(Other definitions for doubter that I've seen before include "E.g. St Thomas" , "one such as Thomas" , "One who is not sure" .)