Huntsman's cry (5-2)
I believe the answer is:
tally-ho
'huntsman's cry' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tally-ho that I've seen before include "Fox-hunting cry" , "Hunt cry" , "Huntsman's cry" , "Huntsperson's cry" , ""I've seen the fox!"" .)