Irishman seats Democrat in chair (5)
I believe the answer is:
sedan
'chair' is the definition.
(sedan chair is a type of chair)
'irishman seats democrat' is the wordplay.
I cannot really understand how this works, but
'democrat' could be 'd' and 'd' is located in the answer.
'irishman' could be 'sean' (common Irish name) and 'sean' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sedan that I've seen before include "Covered seat carried by bearers" , "Saloon-car" , "Type of chair that's carried" , "Chair; car" , "outmoded form of transport" .)