Bury bounder, an uninvited guest (10)
I believe the answer is:
interloper
'an uninvited guest' is the definition.
(an interloper is an intruder or invader)
'bury bounder' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'bounder' becomes 'loper' (I've seen this in another clue).
'inter'+'loper'='INTERLOPER'
(Other definitions for interloper that I've seen before include "Intruder" , "Uninvited attendee" , "one who gatecrashes" , "one entering uninvited" .)