Seats in church look small (6)
I believe the answer is:
chairs
'seats' is the definition.
(I know this)
'church look small' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'look' becomes 'air' (something might have a certain air or look).
'small' becomes 's' (abbreviation - e.g. clothes size).
'ch'+'air'+'s'='CHAIRS'
'in' is the link.
(Other definitions for chairs that I've seen before include "Seats for singles" , "Leads meeting" , "rockers?" , "Seats (that can be electric or musical)" , "people to run meetings" .)