Charge soldier to retreat into Scottish island (7)
I believe the answer is:
arraign
'charge' is the definition.
(arraigning is a kind of charging)
'soldier to retreat into scottish island' is the wordplay.
'soldier' becomes 'gi' (government issue or general issue).
'to retreat' says the letters should be written backwards.
'into' indicates putting letters inside.
'scottish island' becomes 'arran' (I've seen this before).
'gi' back-to-front is 'ig'.
'ig' put inside 'arran' is 'ARRAIGN'.
(Other definitions for arraign that I've seen before include "Accuse of a wrong" , "Call before a court to answer an indictment" , "Accuse, put on trial" , "Act against" , "Bring to trial" .)