This minor criminal is an old forger (9)

I believe the answer is:

ironsmith

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'an old forger' is the definition.
'ironsmith' can be an answer for 'forger'. I am not sure about the 'an old' bit.

'this minor criminal' is the wordplay.
'criminal' indicates anagramming the letters.
'this'+'minor'='thisminor'
'thisminor' with letters rearranged gives 'IRONSMITH'.

'is' is the link.

Can you help me to learn more?

(Other definitions for ironsmith that I've seen before include "Master forger" , "Metalworker" .)

I've seen this clue in The Sunday Times.

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