Split in ERG irritated CON man (7)

I believe the answer is:

grifter

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'con man' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'split in erg irritated' is the wordplay.
'split' becomes 'rift' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'irritated' is an anagram indicator (letters disturbed or irritated).
'erg' anagrammed gives 'ger'.
'rift' inserted within 'ger' is 'GRIFTER'.

Can you help me to learn more?

(Other definitions for grifter that I've seen before include "Cheat in America" , "American conman" .)

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