One enduring celebrity welcomes you (6)
I believe the answer is:
stayer
'one enduring' is the definition.
'celebrity welcomes you' is the wordplay.
'celebrity' becomes 'star' (I've seen this before).
'welcomes' means one lot of letters goes inside another (in sense of 'invites in').
'you' becomes 'ye'.
'star' enclosing 'ye' is 'STAYER'.
(Other definitions for stayer that I've seen before include "One that lasts the course" , "Long-distance runner, rather than sprinter" , "One with lasting qualities" , "marathon man" , "one unlikely to give up" .)