Clearly anxious without foundation (8)

I believe the answer is:

restless

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This clue might be a double definition.

'clearly anxious' is the first definition.
'restless' can be an answer for 'anxious' (thesaurus). I'm not certain of the 'clearly' bit.

'without foundation' is the second definition.
('foundation' can be 'rest' (thesaurus) so maybe 'without foundation' can be ''restless')

Can you help me to learn more?

(Other definitions for restless that I've seen before include "Ill at ease" , "Ceaselessly in motion" , "Fidgety - unable to sleep" , "Always on the move" , "Unable to keep still" .)

I've seen this clue in the Evening Standard.

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