Crossword Genius

Offa for one was stirring cream in (7)

Ross

I believe the answer is:

mercian

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'offa for one' is the definition.
I can't judge whether this defines the answer.

'stirring cream in' is the wordplay.
'stirring' indicates anagramming the letters.
'cream'+'in'='creamin'
'creamin' with letters rearranged gives 'MERCIAN'.

'was' is the link.

Can you help me to learn more?

(Another definition for mercian that I've seen is " Of Offa's kingdom; Crimean (anag.)".)

I've seen this clue in The Times.
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