Dogs making row interrupting church service (8)
I believe the answer is:
mastiffs
'dogs' is the definition.
(mastiff is a kind of dog)
'row interrupting church service' is the wordplay.
'row' becomes 'tiff' (tiff is a kind of row**).
'interrupting' is an insertion indicator.
'church service' becomes 'mass' (I've seen this before).
'tiff' put into 'mass' is 'MASTIFFS'.
'making' is the link.
(Other definitions for mastiffs that I've seen before include "Powerful deep-chested dogs" , "man's best friends?" .)