Crossword Genius

Anything that can reform a thug (5)

Ross

I believe the answer is:

aught

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'anything that' is the definition.
'aught' can be an answer for 'anything' ('aught' means anything). I am not sure about the remainder of the definition.

'reform a thug' is the wordplay.
'reform' is an anagram indicator (letters in a new form).
'a'+'thug'='athug'
'athug' with letters rearranged gives 'AUGHT'.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for aught that I've seen before include "Anything (Shakespearean)" , "Anything at all (archaic)" , "Nothing" , "Emphatically anything" .)

I've seen this clue in the Evening Standard.
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