Crossword Genius

Relative must stop bleating about banana (3)

Ross

I believe the answer is:

nan

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'relative' is the definition.
(I have seen 'Elderly relative' mean 'nan' so perhaps 'relative' could also mean 'nan')

'must stop bleating about banana' is the wordplay.
'NAN' is hidden within the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for nan that I've seen before include "Indian bread - older relative" , "Gran" , "Indian bread; grandma" , "Darling dog" , "type of slightly leavened bread" .)

I've seen this clue in The Mirror.
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