Keep Somalian boxing course (5)
I believe the answer is:
epsom
'course' is the definition.
(a race course)
'keep somalian boxing' is the wordplay.
'boxing' indicates a hidden word (the solution is contained or boxed up by the clue).
'EPSOM' is hidden in the letters of 'keep somalian'.
(Other definitions for epsom that I've seen before include "Derby town" , "Poems about the race-course" , "Derby course" , "Poems about English Derby venue" , "Downs" .)