They're worn to reverse failures (4-5)

I believe the answer is:

flip-flops

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'they're worn' is the definition.
The definition suggests an adverb but the answer is not.

'reverse failures' is the wordplay.
'reverse' becomes 'flip' (flipping is a kind of reversing).
'failures' becomes 'flops' (flop is a kind of failure).
'flip'+'flops'='FLIP-FLOPS'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for flip-flops that I've seen before include "Casual summer footwear" , "Casual sandals" , "Beach footwear" , "Summer shoes" , "Informal footwear" .)

I've seen this clue in The Daily Express.

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