Pub having the wow factor, don't you think? (5)
I believe the answer is:
innit
'don't you think?' is the definition.
'pub having the wow factor' is the wordplay.
'pub' becomes 'inn' (I've seen this before).
'having' means one lot of letters go next to another.
'the wow factor' becomes 'it'.
'inn'+'it'='INNIT'
(Other definitions for innit that I've seen before include "that produces stress for some" , "Mere spoken punctuation" , "do you agree?" , "Isn't it (sl.)" , "Common question" .)