A man is bold showing these off! (10)

I believe the answer is:

abdominals

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'these off' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'a man is bold' is the wordplay.
'a man is bold' anagrams to 'ABDOMINALS'.
Though, I'm unsure how this is indicated.

'showing' is the link.

Can you help me to learn more?

I've seen this clue in The Sunday Times.

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