Surround men deployed around firm mountain road (9)
I believe the answer is:
encompass
'surround' is the definition.
(I've seen this before)
'men deployed around firm mountain road' is the wordplay.
'deployed' indicates an anagram.
'around' means one lot of letters goes inside another.
'firm' becomes 'co' (a firm is a company).
'mountain road' becomes 'pass' (I've seen this before).
'men' with letters rearranged gives 'enm'.
'enm' enclosing 'co' is 'encom'.
'encom'+'pass'='ENCOMPASS'
(Other definitions for encompass that I've seen before include "Contain or encircle" , "Comprehensively include" , "Embrace" , "ring" , "Surround; include" .)