Soldier who had a point in joining the army (6)
I believe the answer is:
lancer
'soldier' is the definition.
(lancer is a kind of soldier)
'had a point in joining the army' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
'point' could be 'e' (E is an example) and 'e' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'who' acts as a link.
Can you help me to learn more?
(Other definitions for lancer that I've seen before include "Spearman (as in dance?)" , "Cavalry soldier" , "Former cavalryman" .)