Centre of attention in red-hot Sunday best! (6)

I believe the answer is:

finery

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

'sunday best' is the definition.

'centre of attention in red-hot' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for finery that I've seen before include "Elaborate clothing, jewellery etc" , "Glad rags, best duds" , "Ostentatious clothing" , "Showy clothing" , "smart clothes" .)

I've seen this clue in the Irish Times.

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