Country in charge of the match (5)
I believe the answer is:
fusee
'the match' is the definition.
(type of flare)
'country in charge' is the wordplay.
'country' becomes 'us' (US is an example).
'in' indicates putting letters inside.
'charge' becomes 'fee' (fee is a kind of charge).
'us' inserted inside 'fee' is 'FUSEE'.
'of' acts as a link.
(Other definitions for fusee that I've seen before include "match" , "part of watch" , "pulley" .)