Term is used out of title (6)
I believe the answer is:
mister
'title' is the definition.
'term is used' is the wordplay.
'used' indicates anagramming the letters.
'term'+'is'='termis'
'termis' anagrammed gives 'MISTER'.
'out of' is the link.
(Other definitions for mister that I've seen before include "Merits of form of address to man" , "Set rim (anag.)" , "Male form of address" , "that's what you'd call him" , "Form of address to a man, used without his name" .)