Follow orders, getting medal with end of hostility (4)
I believe the answer is:
obey
'follow orders' is the definition.
(to obey someone is to follow their orders)
'medal with end of hostility' is the wordplay.
'medal' becomes 'OBE' (Order of the British Empire).
'with' is a charade indicator (letters next to each other).
'end of' suggests the final letters.
The last letter of 'hostility' is 'y'.
'obe'+'y'='OBEY'
'getting' acts as a link.
(Other definitions for obey that I've seen before include "Carry out (orders)" , "Carry out (an order)" , "Hear" , "Heed" , "Submit to authority" .)