One standing at the side of the room by work buffet (6)
I believe the answer is:
wallop
'buffet' is the definition.
(thesaurus)
'one standing at the side of the room by work' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is found in the answer.
'side' could be 'l' (abbreviation for left) and 'l' is found within the answer.
'of' could be 'o' and 'o' is found within the answer.
'work' could be 'w' (physics abbreviation) and 'w' is present in the answer.
The remaining letters 'lp' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wallop that I've seen before include "Beer - hit hard" , "ale?" , "Best" , "Beat" , "Thump" .)