Hi Marty.
A (la) N T (itchmars) H = maintains (keeps) the borders
with = added to
space = em (spacing measurement in printing)
Def = hundreds of flowers in Nepal
Nepalese National Anthem is "Sayaun thunga phool ka" translates to English as "Hundreds of flowers"
Man (anagram fodder)
is shot = anagrind
outside = container indicator of 'the'
Box = secondary container of the anagram of 'Man' to be boxed in
Cryptic def = scoring for his country.
Score - being music - for his country - (national) anthem
AN the M