Misguided notes involving northern New York poet (8)
I believe the answer is:
tennyson
'poet' is the definition.
(Alfred, Lord Tennyson)
'misguided notes involving northern new york' is the wordplay.
'misguided' indicates anagramming the letters (I've seen this in other clues).
'involving' indicates putting letters inside.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'new york' becomes 'ny'.
'notes' anagrammed gives 'teson'.
'n'+'ny'='nny'
'teson' enclosing 'nny' is 'TENNYSON'.
(Other definitions for tennyson that I've seen before include "Poet Laureate from 1850 to 1892" , "Alfred Lord ..., Victorian poet" , "British poet" , "English nineteenth century poet (Maud)" , "English Victorian poet" .)