Being restive is not any use but might be (6)

I believe the answer is:

uneasy

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'being restive' is the definition.
(synonyms)

'not any use but might be' is the wordplay.
'any use' can be anagrammed to 'UNEASY'.
Though, I am unsure how the anagram is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for uneasy that I've seen before include "Restless, perturbed" , "Jumpy" , "Disturbed" , "Feeling troubled or uncomfortable" , "Anxious, unquietly" .)

I've seen this clue in The Globe and Mail.

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