In a resentful manner (8)

I think it could be either:

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bitterly

'in a resentful manner' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for bitterly that I've seen before include "Sharply, pungently" , "With resentment" , "Acrimoniously" , "Resentfully, rancorously" , "In a resentful manner" .)

I've seen this clue in The Irish Times and The Telegraph.

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