Jargon in capital university describing, say, beer (8)
I believe the answer is:
legalese
'jargon' is the definition.
(legal jargon)
'capital university describing say beer' is the wordplay.
'capital university' becomes 'LSE' (London School of Economics).
'describing' is an insertion indicator (describe can mean to form the outline of).
'say' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'beer' becomes 'ale' (type of beer).
'eg'+'ale'='egale'
'lse' placed around 'egale' is 'LEGALESE'.
'in' acts as a link.
(Other definitions for legalese that I've seen before include "it's hard for most to understand" , "Special terms" , "Solicitor's jargon" , "contract wording?" , "formal language" .)