Crossword Genius

Perform for that misguided brute Thomas! (7)

Ross

I believe the answer is:

doubter

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'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" .)

I've seen this clue in the Evening Standard.
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