I find smoker unusually annoying (7)
I believe the answer is:
irksome
'annoying' is the definition.
(I've seen this before)
'i find smoker unusually' is the wordplay.
'find' means one lot of letters go next to another.
'unusually' indicates anagramming the letters.
'smoker' is an anagram of 'rksome'.
'i'+'rksome'='IRKSOME'
(Other definitions for irksome that I've seen before include "Annoying or tiresome" , "Smokier (anag.)" , "Bothersome, annoying" , "Tediously annoying" , "bugging" .)