Isn't that just like a fellow! (7)

I believe the answer is:

donnish

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'like a fellow' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for donnish that I've seen before include "Like fellow, perhaps" , "Like a college teacher" , "Scholarly" , "Resembling academic" , "Typical of lecturer" .)

I've seen this clue in the Evening Standard.

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