Ten entering a church in Devon town (9)
I believe the answer is:
axminster
'devon town' is the definition.
(town in Devon)
'ten entering a church' is the wordplay.
'ten' becomes 'X' (Roman numeral).
'entering' is an insertion indicator.
'church' becomes 'minster' (minster is a kind of church).
'a'+'minster'='aminster'
'x' inserted inside 'aminster' is 'AXMINSTER'.
'in' acts as a link.
(Other definitions for axminster that I've seen before include "Carpeting" , "Devon town; carpet" , "West Country town" , "south-west town" , "Kind of patterned carpet" .)