Perspire if consuming trifles (10)

I believe the answer is:

fripperies

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

'trifles' is the definition.
(I know this)

'perspire if consuming' is the wordplay.
'perspire if' can be anagrammed to 'FRIPPERIES'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.

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