No, a fish shows style (7)

I believe the answer is:

fashion

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

'style' is the definition.
(I know that style can be written as fashion)

'no a fish' is the wordplay.
'no a fish' anagrams to 'FASHION'.
Though, I'm not sure how this is indicated.

'shows' acts as a link.

Can you help me to learn more?

(Other definitions for fashion that I've seen before include "the latest thing" , "Vogue, trend" , "Ton" , "Trend, mode" , "On a fish (anag.)" .)

I've seen this clue in The Irish Independent.

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