Mail perhaps from king in love (6)
I believe the answer is:
armour
'mail perhaps' is the definition.
(mail is a kind of armour)
'king in love' is the wordplay.
I cannot really understand how this works, but
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is located in the answer.
'love' could be 'amour' (I've seen this before) and 'amour' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'from' acts as a link.
Can you help me to learn more?
(Other definitions for armour that I've seen before include "Battle protection" , "Soldier's body protection" , "Knight's attire" , "Protective clothing" , "Chain mail, e.g." .)