Corrupt barrister has no time for obstructions (8)
I believe the answer is:
barriers
'for obstructions' is the definition.
(barrier is a kind of obstruction)
'corrupt barrister has no time' is the wordplay.
'corrupt' is an anagram indicator (a corrupted spelling of the word).
'has no' suggests deleting specific letters.
'time' becomes 't' (abbreviation).
'barrister' with 't' removed is 'barriser'.
'barriser' anagrammed gives 'BARRIERS'.
(Other definitions for barriers that I've seen before include "They're put up to block or protect" , "Erections to control or impede advances" , "Constructions that prevent or impede advance" , "Obstacles to movement" , "Obstructions" .)