Cleat comes loose, but a great success (5)

I believe the answer is:

eclat

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'a great success' is the definition.
(I've seen this before)

'cleat comes loose' is the wordplay.
'cleat' anagrams to 'ECLAT'.
But, I'm not sure how this is indicated.

'but' is the link.

Can you help me to learn more?

(Other definitions for eclat that I've seen before include "Brilliance" , "Universal approval" , "Splendour; renown" , "French social distinction or success" , "Social distinction in France" .)

I've seen this clue in The Sun.

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