One who trades incense with old companion (9)

I believe the answer is:

exchanger

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'one who trades' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'incense with old companion' is the wordplay.
'incense' becomes 'anger' (incense can mean to anger).
'with' is a charade indicator (letters next to each other).
'old' becomes 'ex' (prefix meaning former or onetime).
'companion' becomes 'ch' (Companion of Honour).
'ex'+'ch'='exch'
'anger' put after 'exch' is 'EXCHANGER'.

Can you help me to learn more?

(Another definition for exchanger that I've seen is " Bank employee".)

I've seen this clue in The Independent.

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