Disregard temper tantrum over travel documents (9)
I believe the answer is:
passports
'travel documents' is the definition.
(I've seen this before)
'disregard temper tantrum over' is the wordplay.
'disregard' becomes 'pass' (I've seen this in another clue).
'temper tantrum' becomes 'strop' (I've seen this before).
'over' shows that the letters should be reversed in order.
'strop' reversed gives 'ports'.
'pass'+'ports'='PASSPORTS'
(Other definitions for passports that I've seen before include "Authorisation to travel" , "Government documents needed for foreign travel" , "Having admission documents" , "Documents allowing travel" , "Authorisations to travel abroad" .)