Being thrown out, I'd return as an uninvited guest (8)
I believe the answer is:
intruder
'an uninvited guest' is the definition.
(I've seen this before)
'being thrown out i'd return' is the wordplay.
'being thrown out' indicates an anagram.
'id'+'return'='idreturn'
'idreturn' with letters rearranged gives 'INTRUDER'.
'as' acts as a link.
(Other definitions for intruder that I've seen before include "One entering unasked" , "One making uninvited entry" , "Butter in" , "Burglar, or one who barges in" , "Trespasser" .)