We must return to start school in the capital of Ecuador, though we might like to avoid it. (6)
I believe the answer is:
eschew
'the capital of ecuador though we might like to avoid it' is the definition.
I can't judge whether this definition defines the answer.
'we must return to start school' is the wordplay.
'must return' says the letters should be written backwards.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'start' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'school' becomes 'sch' (abbreviation).
'we' backwards is 'ew'.
'e'+'sch'='esch'
'ew' put after 'esch' is 'ESCHEW'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for eschew that I've seen before include "'Stay clear of, shun (6)'" , "Deliberately stay clear of" , "'Avoid, stay away from (6)'" , "'Avoid, keep away from (6)'" , "Abstain from, shun" .)