Crossword clue :

Hunting aid for Bob and Mister Ed? (8,5)

known letters : ........ .o...
publication : Glasgow Herald
setter : not specified

Suggested solution :

Stalking Horse

Bob=s ? (not sure why - please email me if you know)
Mister Ed = talking horse

Stalking Horse is a horse used in hunting to help reduce the likelihood of people alarming their prey.

http://en.wikipedia.org/wiki/Stalking_horse