Marxist, leaving to secure work, bound to prevent access (5,3)

'bound to prevent access' is the definition.
(as in a roped off area)

'marxist leaving to secure work' is the wordplay.
'marxist' becomes 'red' (red can mean a revolutionary).
'leaving' becomes 'off' (I've seen this in other clues).
'to secure' is an insertion indicator.
'work' becomes 'op' (common abbreviation for 'opus').
'red'+'off'='redoff'
'redoff' going around 'op' is 'ROPED OFF'.