Educate hearing dog for disasters (11)

I believe the answer is:

trainwrecks

I'm a little stuck... Click here to teach me more about this clue!

'disasters' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'educate hearing dog' is the wordplay.
'educate' becomes 'train' (synonyms).
'hearing dog' becomes 'wrecks' (I can't explain this - if you can you should give a lot more credence to this answer).
'train'+'wrecks'='TRAINWRECKS'

'for' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app