Nick in clover? Failing did Clegg a service, ultimately (6,4)

I believe the answer is:

gilded cage

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'nick in clover?' is the definition.
The definition suggests a singular noun which matches the answer.

'failing did clegg a service ultimately' is the wordplay.
'failing' indicates anagramming the letters (a failed spelling of the word).
'ultimately' indicates one should take the final letters.
The final letter of 'service' is 'e'.
'did'+'clegg'+'a'='didclegga'
'didclegga' anagrammed gives 'gildedcag'.
'gildedcag'+'e'='GILDED CAGE'

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