Advertise target when putting in plumbing feature (8)
I believe the answer is:
plughole
'plumbing feature' is the definition.
(part of plumbing system)
'advertise target when putting' is the wordplay.
'advertise' becomes 'plug' (plugging is a kind of advertizing).
'target when putting' becomes 'hole' (as in putting in golf).
'plug'+'hole'='PLUGHOLE'
'in' acts as a link.
(Other definitions for plughole that I've seen before include "Bath drain" , "outlet" , "It can be stopped" , "What's designed for draining" .)