Complain about surge of love within (6)

I believe the answer is:

grouse

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'complain' is the definition.
(grouse can mean to complain or grumble)

'about surge of love within' is the wordplay.
'about' is an anagram indicator.
'of love' becomes 'o' (I can't explain this - if you can you should give a lot more credence to this answer).
'within' indicates putting letters inside.
'surge' anagrammed gives 'gruse'.
'gruse' placed around 'o' is 'GROUSE'.

Can you help me to learn more?

(Other definitions for grouse that I've seen before include "Plump game bird" , "See game bird" , "Complain like gamebird" , "No shooting it before 12 August" , "Complain like game bird" .)

I've seen this clue in The Mirror.

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