Understanding, egg on verbally (7)
I believe the answer is:
insight
'understanding' is the definition.
(insight is a kind of understanding)
'egg on verbally' is the wordplay.
'egg on' becomes 'incite' (synonyms).
'verbally' shows a homophone (sound like).
'incite' sounds like 'INSIGHT'.
(Other definitions for insight that I've seen before include "Perceptiveness" , "Clear or deep perception of a situation" , "Intuition" , "comprehension" , "Special knowledge" .)