British colonel in uniform in charge of the country (7)
I believe the answer is:
bucolic
'of the country' is the definition.
(I've seen this before)
'british colonel in uniform in charge' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in BBC).
'colonel' becomes 'col'.
'in' indicates putting letters inside.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'u'+'ic'='uic'
'col' going within 'uic' is 'ucolic'.
'b'+'ucolic'='BUCOLIC'
(Other definitions for bucolic that I've seen before include "Rustic - pastoral" , "Agrarian" , "Of rural or pastoral life" , "Pastoral poem" , "Characteristic of country life" .)