Crossword Genius

Mention fastener by one's ear? (6)

Ross

I believe the answer is:

broach

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

'mention' is the definition.
(thesaurus)

'fastener by one's ear?' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
The remaining letters 'broch' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for broach that I've seen before include "crack" , "Hint" , "Raise (a sensitive subject)" , "Raise (a sensitive topic)" , "Raise a topic for discussion" .)

I've seen this clue in The Telegraph.
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