Betting caller will bring spaniel (8)
I believe the answer is:
springer
'spaniel' is the definition.
(I know that springer is a type of spaniel)
'betting caller' is the wordplay.
'betting' becomes 'sp'.
'caller' becomes 'ringer' (someone ringing someone on the phone).
'sp'+'ringer'='SPRINGER'
'will bring' is the link.
(Other definitions for springer that I've seen before include "A spaniel; stone in arch" , "Shown [AT CRUFTS]" , "Game dog" , "Kind of spaniel" , "hound" .)