One's had a fill of Tory representatives! (5)
I believe the answer is:
icons
'tory representatives' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
'one's had a fill of' is the wordplay.
'one' becomes 'i' (Roman numeral).
'had' is a charade indicator (letters next to each other).
'a fill of' becomes 'cons' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'i'+'cons'='ICONS'
Can you help me to learn more?
(Other definitions for icons that I've seen before include "Graphic symbols on computer screens" , "Holy paintings" , "Sacred paintings or computer screen symbols" , "Sonic (anag)" , "revered art" .)