Expected to be outstanding? (3)
I believe the answer is:
due
I believe this clue is a double definition.
'expected' is the first definition.
(similar in meaning)
'outstanding?' is the second definition.
(I've seen this before)
'to be' acts as a link.
(Other definitions for due that I've seen before include "Escort" , "Appropriate - fee - now owing" , "Owed - expected" , "Entitlement" , "Owed as a debt" .)