Watson's colleague lacking potassium about to have a bite of meat (7)

I believe the answer is:

creatic

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'watson's colleague lacking potassium about' is the definition.
I can't tell whether this defines the answer.

'have a bite of meat' is the wordplay.
I cannot quite see how this works, but
'have' could be 'eat' (have can mean to eat or consume) and 'eat' is found within the answer.
This explanation may well be incorrect...

'to' is the link.

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I've seen this clue in The Times.

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