Burns before composing ode errs, caught with proctor’s jacket (10)

'burns before' is the definition.
(to burn is to create an electronic record)

'composing ode errs caught with proctor's jacket' is the wordplay.
'composing' indicates an anagram.
'caught' becomes 'c' (cricket abbreviation).
'with' is a charade indicator (letters next to each other).
'proctor's jacket' becomes 'pr' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ode'+'errs'+'c'='odeerrsc'
'odeerrsc' is an anagram of 'erecords'.
'erecords' put after 'pr' is 'PRERECORDS'.