Resentful: a bit grieved in any case (5)

I believe the answer is:

angry

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'resentful' is the definition.
(similar in meaning)

'a bit grieved in any case' is the wordplay.
'a' becomes 'an'.
'bit' indicates taking the first letters (I've seen 'bits of' mean this).
'in any case' becomes 'ry' (I can't explain this - if you can you should believe this answer much more).
The first letter of 'grieved' is 'g'.
'an'+'g'+'ry'='ANGRY'

Can you help me to learn more?

(Other definitions for angry that I've seen before include "Furious" , "Irate, mad" , "Cross" , "Incensed" , "Irate, wrathful" .)

I've seen this clue in the Evening Standard.

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