Deny working at this time (4)
I believe the answer is:
noon
'time' is the definition.
(noon is a kind of time)
'deny working at' is the wordplay.
'deny working' becomes 'no' (I can't justify this - if you can you should believe this answer much more).
'at' becomes 'on' (location).
'no'+'on'='NOON'
'this' acts as a link.
Can you help me to learn more?
(Other definitions for noon that I've seen before include "A moment of time" , "The middle of the day" , "when PM starts" , "High time of day?" , "See 8" .)