Pressure points in seats (4)
I believe the answer is:
pews
'in seats' is the definition.
'pews' can be an answer for 'seats' (I've seen this before). I'm not sure about the 'in' bit.
'pressure points' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'points' becomes 'ews' (I can't justify this - if you can you should believe this answer much more).
'p'+'ews'='PEWS'
Can you help me to learn more?
(Other definitions for pews that I've seen before include "Church benches" , "Church seating" , "Church seats" .)