Outstanding work of Pindar possibly read aloud (4)
I believe the answer is:
owed
'outstanding' is the definition.
(as in an outstanding debt)
'work of pindar possibly read aloud' is the wordplay.
'work of pindar possibly' becomes 'ode' (the poet Pindar wrote odes).
'read aloud' indicates a 'sounds like' (homophone) clue.
'ode' is a homophone of 'OWED'.
(Other definitions for owed that I've seen before include "(Sum) due for payment" , "to be paid" , "In debt to" , "Was due to pay" , "Outstanding" .)