Rest? Yes, on Tuesday! (3)

I believe the answer is:

sit

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'rest?' is the definition.
(thesaurus)

'yes on tuesday' is the wordplay.
'yes on' becomes 'si' (I can't explain this - if you can you should believe this answer much more).
'tuesday' becomes 't'.
'si'+'t'='SIT'

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(Other definitions for sit that I've seen before include "Brood" , "as magistrates do" , "Take a seat; pose" , "Take weight off feet" , "Take a pew, an exam" .)

I've seen this clue in the Evening Standard.

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