Resentful feeling after long walk, briefly good for time at start (6)

I believe the answer is:

grudge

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'resentful feeling' is the definition.
'grudge' can be an answer for 'feeling' (grudge is a kind of feeling). I am not certain of the 'resentful' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grudge that I've seen before include "Active resentment" , "Persistent feeling of resentment" , "Envy or bad feeling towards" , "Long-standing feeling of resentment" , "Envy, resent having to give" .)

I've seen this clue in The Times.

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