Crossword Genius

Having misgivings? That's rather unlikely (8)

Ross

I believe the answer is:

doubtful

I'm a little stuck... Click here to teach me more about this clue!

'unlikely' is the definition.
(I've seen this before)

'having misgivings? that's rather' is the wordplay.
I cannot quite see how this works, but
'misgivings?' could be 'doubt' (I've seen this in another clue) and 'doubt' is present in the answer.
The remaining letters 'ful' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for doubtful that I've seen before include "Dubious" , "Unsettled in mind or opinion" , "Vacillating" , "Uncertain, unlikely" , "Unsure" .)

I've seen this clue in the Evening Standard.
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