Standing up before the court briefly (5)
I believe the answer is:
erect
'standing up' is the definition.
(I've seen this before)
'before the court briefly' is the wordplay.
'before' becomes 'ere' (poetic term for 'before').
'the court briefly' becomes 'ct' (abbreviation used in road names; 'briefly' indicates a short form).
'ere'+'ct'='ERECT'
(Other definitions for erect that I've seen before include "Upstanding" , "Assemble" , "Upright; construct" , "Crete (anag)" , "Standing straight" .)