March could be his start of success round country (5)
I believe the answer is:
sousa
'march could be his' is the definition.
The definition suggests a singular noun which matches the answer.
'start of success round country' is the wordplay.
'start' says to take the initial letters.
'round' is a reversal indicator.
'country' becomes 'usa' (U.S.A. is an example).
The first letters of 'of success' is 'os'.
'os' written backwards gives 'so'.
'so'+'usa'='SOUSA'
Can you help me to learn more?
(Other definitions for sousa that I've seen before include "John Philip -, composer of famous marches (The Stars and Stripes for Ever)" , "American composer known for marches" , "John Philip --, American march composer" , "Composer of "The Stars and Stripes Forever"" , "US march king" .)