We sat about on road for event supervisor (7)
I believe the answer is:
steward
'event supervisor' is the definition.
(I've seen this before)
'we sat about on road' is the wordplay.
'about' indicates anagramming the letters.
'on' says to put letters next to each other.
'road' becomes 'rd' (abbreviation**).
'we'+'sat'='wesat'
'wesat' with letters rearranged gives 'stewa'.
'stewa'+'rd'='STEWARD'
'for' acts as a link.
(Other definitions for steward that I've seen before include "Crew member" , "Waiter; estate manager" , "Maritime waiter" , "Shipboard attendant" , "Official at function" .)