Honestly uneasy in private (2,3,3)

I believe the answer is:

on the sly

'in private' is the definition.
(I've seen this before)

'honestly uneasy' is the wordplay.
'uneasy' indicates anagramming the letters.
'honestly' is an anagram of 'ON THE SLY'.

(Other definitions for on the sly that I've seen before include "With craft" , "in private" , "Under the table" , "Behind someone's back" , "Honestly (anag) - dishonestly" .)

I've seen this clue in The Guardian.

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