Inclination and skill required for defence (7)
I believe the answer is:
rampart
'for defence' is the definition.
(rampart is a kind of defence)
'inclination and skill' is the wordplay.
'inclination' becomes 'ramp'.
'and' means one lot of letters go next to another.
'skill' becomes 'art' (I've seen this before).
'ramp'+'art'='RAMPART'
'required' acts as a link.
(Other definitions for rampart that I've seen before include "Defensive earthwork" , "barricade" , "Battlement, fortification" , "Bulwark, wall" , "Defensive structure" .)