Judgement of City is one accepted by academic (8)
I believe the answer is:
decision
'judgement' is the definition.
(decision is a kind of judgement)
'city is one accepted by academic' is the wordplay.
'city' becomes 'ec' (the City of London postcode).
'one' becomes 'i' (Roman numeral).
'accepted by' indicates putting letters inside.
'academic' becomes 'don' (I've seen this before).
'ec'+'is'+'i'='ecisi'
'ecisi' going within 'don' is 'DECISION'.
'of' acts as a link.
(Other definitions for decision that I've seen before include "Judgment, verdict" , "A reasoned judgement about something, no dithering" , "Resolution reached after consideration" , "Outcome of discussion" , "Result!" .)