Representatives providing instruction to get rid of barriers (9)
I believe the answer is:
delegates
'representatives' is the definition.
(delegate is a kind of representative)
'instruction to get rid of barriers' is the wordplay.
'instruction to get rid of' becomes 'dele' (printing symbol meaning 'delete').
'barriers' becomes 'gates' (gate is a kind of barrier).
'dele'+'gates'='DELEGATES'
'providing' acts as a link.
(Other definitions for delegates that I've seen before include "They're appointed to represent others" , "Representatives or deputies" , "Confers authority on agent or subordinate" .)