Speaker welcomed by senator, a Tory (6)
I believe the answer is:
orator
'speaker' is the definition.
(orator is a kind of speaker)
'welcomed by senator a tory' is the wordplay.
'welcomed by' indicates a hidden word.
'ORATOR' is hidden within 'senator a tory'.
(Other definitions for orator that I've seen before include "Eloquent type" , "One who holds forth" , "A fluent public speaker" , "A gifted public speaker" , "Eloquent public speaker" .)