See a deer and beat it (7)
I believe the answer is:
vamoose
'beat it' is the definition.
(I've seen this before)
'see a deer' is the wordplay.
'see' becomes 'v' (short for 'vide', Latin meaning 'see elsewhere').
'deer' becomes 'moose' (moose is a kind of deer).
'v'+'a'+'moose'='VAMOOSE'
'and' acts as a link.
(Other definitions for vamoose that I've seen before include "Shoo!" , "Fly" , "Clear off" , "Hop it, amigo!" , "take flight!" .)