Ready to get a place to sit (4)
I believe the answer is:
seat
'place to sit' is the definition.
(I've seen this before)
'ready to get a' is the wordplay.
'ready' becomes 'set' (set can mean ready or prepared).
'to get' indicates putting letters inside.
'set' going around 'a' is 'SEAT'.
(Other definitions for seat that I've seen before include "Spanish car" , "pew?" , "MP's place in parliament" , "Place to sit" , "Parliamentary constituency" .)