Seat for one in charge of meeting (5)
I believe the answer is:
This might be a double definition.
'seat for one' is the first definition.
(I've seen this before)
'charge of meeting' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'in' acts as a link.
Can you help me to learn more?
(Other definitions for chair that I've seen before include "See 4" , "president" , "Professorship" , "Windsor, for example" , "Most important seat in committee" .)