Country area, remote delta, invaded by the military (8)
I believe the answer is:
farmyard
'country area' is the definition.
(area in the countryside)
'remote delta invaded by the military' is the wordplay.
'remote' becomes 'far' (synonyms).
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'invaded by' means one lot of letters goes inside another.
'the military' becomes 'army' (the armed forces).
'far'+'d'='fard'
'fard' placed around 'army' is 'FARMYARD'.
(Other definitions for farmyard that I've seen before include "rural spot" , "where chicken appears?" , "Fry drama (anag)" , "Agricultural enclosure" , "Area surrounded by agricultural buildings" .)