Was dutifully on the line (maybe the oche) (4)
I believe the answer is:
toed
'line maybe the oche' is the definition.
I can't tell whether this defines the answer.
'was dutifully on the' is the wordplay.
'was dutifully' becomes 'oed' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'oed' put after 't' is 'TOED'.
Can you help me to learn more?
(Other definitions for toed that I've seen before include "Kicked" , "inferior terminal projections" .)