Loner wasted time getting soldiers registering (9)
I believe the answer is:
enrolment
'loner wasted time getting soldiers registering' is the definition.
I can't judge whether this defines the answer.
'loner wasted time getting soldiers' is the wordplay.
'wasted' is an anagram indicator.
'time' becomes 't' (abbreviation).
'getting' means one lot of letters goes inside another.
'soldiers' becomes 'men' (men can mean a group of soldiers).
'loner' anagrammed gives 'enrol'.
'enrol'+'t'='enrolt'
'enrolt' enclosing 'men' is 'ENROLMENT'.
Can you help me to learn more?
(Other definitions for enrolment that I've seen before include "Registration" , "Joining" , "matriculation" , "Act of entering on a list of members" , "signing up" .)