Crossword Genius

If the order is not the usual he'll help himself (5)

Ross

I believe the answer is:

thief

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'not the usual he'll help himself' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'if the order' is the wordplay.
'order' indicates an anagram.
'if'+'the'='ifthe'
'ifthe' is an anagram of 'THIEF'.

'is' is the link.

Can you help me to learn more?

(Other definitions for thief that I've seen before include "nicker?" , "Crook" , "Aus. or Scots city" , "He takes" , "See 3" .)

I've seen this clue in The Globe and Mail.
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