Faculty I quote on the radio (8)
I believe the answer is:
eyesight
'faculty' is the definition.
(I know that eyesight is a type of visual modality)
'i quote on the radio' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'quote' becomes 'cite' (synonyms).
'on the radio' shows a homophone (sound like).
'cite' sounds like 'sight'.
'eye'+'sight'='EYESIGHT'
(Other definitions for eyesight that I've seen before include "Seeing faculty" , "Purpose of certain organs" , "quality of viewing" , "View" , "Requirement to look" .)