Term of address to a maker of mitres (6)
I believe the answer is:
mister
'term of address to a maker' is the definition.
I can't judge whether this definition defines the answer.
'of mitres' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'mitres' anagrammed gives 'MISTER'.
Can you help me to learn more?
(Other definitions for mister that I've seen before include "Form of address to a man, used without his name" , "Male form of address" , "Set rim (anag.)" , "Mr" , "that's what you'd call him" .)