Cartoon character’s news story curtailed by having opening trimmed (6-3)

'cartoon character's' is the definition.
(I've seen this before)

'curtailed by having opening trimmed' is the wordplay.
'curtailed by' becomes 'scooby' (I can't justify this - if you can you should give a lot more credence to this answer).
'having' is a charade indicator (letters next to each other).
'opening' becomes 'door' (a door is an opening).
'trimmed' means to remove the last letter (the final letter is trimmed off).
'door' with its final letter taken off is 'doo'.
'scooby'+'doo'='SCOOBY-DOO'

'news story' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?