A hint of resignation? (4)

I believe the answer is:

sign

'a hint' is the definition.
(thesaurus)

'of resignation?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'SIGN' can be found hidden inside 'resignation'.

(Other definitions for sign that I've seen before include "As the star was for 14 across" , "Traffic control - to write one's name" , "Notice; omen" , "Public notice; portent" , "Augury" .)

I've seen this clue in the Evening Standard.

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