Shelter half a mile east (3)
I believe the answer is:
lee
'shelter' is the definition.
(thesaurus)
'half a mile east' is the wordplay.
'half a' suggests halving the letters.
'east' becomes 'e' ('E' can be a synonym of 'east').
'mile' with half the letters taken is 'le'.
'le'+'e'='LEE'
(Other definitions for lee that I've seen before include "Shelter" , "The side that's sheltered from the wind" , "Area sheltered from the wind" , "Robert E. - - , US hero" , "Commander of the Confederate States Army in the American Civil War" .)