A wild horse on dry land (6)
I believe the answer is:
ashore
'on dry land' is the definition.
(I've seen this before)
'a wild horse' is the wordplay.
'wild' is an anagram indicator.
'horse' is an anagram of 'shore'.
'a'+'shore'='ASHORE'
(Other definitions for ashore that I've seen before include "in port?" , "Home for the sailor" , "on terra firma" , "Off the boat" , "Aground" .)