One Tory figure (4)
I believe the answer is:
icon
'figure' is the definition.
(I've seen this in another clue)
'one tory' is the wordplay.
'one' becomes 'i' (Roman numeral).
'tory' becomes 'con' (abbreviation for Conservative).
'i'+'con'='ICON'
(Other definitions for icon that I've seen before include "A good figure" , "representing a saint?" , "famous personality" , "Religious painting of Greek origin" , "Idol" .)