Crossword Genius

Express discomfort when nanna hugs Oscar (5)

Ross

I believe the answer is:

groan

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

'express discomfort' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

'nanna hugs oscar' is the wordplay.
I cannot quite see how this works, but
'oscar' could be 'o' (phonetic alphabet: alpha, bravo, charlie etc.) and 'o' is found in the answer.
The remaining letters 'gran' 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).

'when' acts as a link.

Can you help me to learn more?

(Other definitions for groan that I've seen before include "painful sigh" , "Sound of one in pain" , "Sound of pain or disapproval" , "Cry of pain or despair" , "Moan, grumble" .)

I've seen this clue in the Sydney Morning Herald.
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