Uninvited visitor at home tense, more vulgar (8)
I believe the answer is:
intruder
'uninvited visitor' is the definition.
(I've seen this before)
'home tense more vulgar' is the wordplay.
'home' becomes 'in' (to be in is to be (at) home).
'tense' becomes 't' (grammatical abbreviation).
'more vulgar' becomes 'ruder' (I've seen this before).
'in'+'t'+'ruder'='INTRUDER'
'at' acts as a link.
(Other definitions for intruder that I've seen before include "I'd return (anag.)" , "Housebreaker" , "Unwanted visitor" , "Uninvited guest" , "Person who comes in being neither invited nor wanted" .)