Canine line didn't end with soldier (5)
I believe the answer is:
corgi
'canine' is the definition.
(I know that corgi is a type of dog)
'line didn't end with soldier' is the wordplay.
I cannot quite see how this works, but
'soldier' could be 'or' (soldier from Other Ranks) and 'or' is present in the answer.
The remaining letters 'cgi' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for corgi that I've seen before include "Cardigan, possibly" , "The Queen's favourite?" , "man's best friend" , "HM's favourite dog" , "Toy car manufacturer" .)