Programme about a US soldier leading troops (7)
I believe the answer is:
regimen
'programme' is the definition.
(I know that regimen is a type of programme)
'about a us soldier leading troops' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'a us soldier' becomes 'GI' (GI can mean an American soldier).
'leading' says to put letters next to each other.
'troops' becomes 'men' (both can mean soldiers).
're'+'gi'+'men'='REGIMEN'
(Other definitions for regimen that I've seen before include "Method of working" , "Mere gin for a course of treatment" , "Prescribed system of diet and exercise - mere gin (anag)" , "Prescribed course of diet, exercise, etc" , "Merge in (anag.)" .)