Redhead in love provides protection for warrior (6)
I believe the answer is:
armour
'protection for warrior' is the definition.
I can't judge whether this definition defines the answer.
'redhead in love' is the wordplay.
'redhead' becomes 'r' (the head/first letter of 'red').
'in' means one lot of letters goes inside another.
'love' becomes 'amour' ('love' in French).
'r' inserted inside 'amour' is 'ARMOUR'.
'provides' is the link.
Can you help me to learn more?
(Other definitions for armour that I've seen before include "Protective apparel" , "Metal or other protective plating for body" , "Old warrior's suit" , "Protection for a fighter" , "Personal protection" .)