Wearing bell-bottoms, adopts retro slogan (5)

I believe the answer is:

motto

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

'slogan' is the definition.
(I know that slogan can be written as motto)

'wearing bell-bottoms adopts retro' is the wordplay.
'MOTTO' is hidden back-to-front within the letters.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for motto that I've seen before include "It may be proverbial" , "Catchphrase" , "Recurring musical phrase" , "Slogan encapsulating self-image" , "Short sentence adopted as rule of conduct" .)

I've seen this clue in The Irish Times.

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