Sailors attending course find something to keep them going (5,5)
I believe the answer is:
epsom salts
'something to keep them going' is the definition.
(type of laxative - something to help you 'go')
'sailors attending course' is the wordplay.
'sailors' becomes 'salts' (salt is a kind of sailor).
'attending' means one lot of letters go next to another.
'course' becomes 'epsom' (a race course).
'salts' put after 'epsom' is 'EPSOM SALTS'.
'find' is the link.
(Other definitions for epsom salts that I've seen before include "Medicinal preparation" , "a purge" , "Purgative" , "Medicine taken for heartburn and constipation" , "They should clear out!" .)