Crossword Genius

Beastly collection delivered by angry mailman biting family dog -- that's back to front (6,7)

Ross

I believe the answer is:

animal product

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

'angry mailman biting family dog that's back to front' is the definition.
I can't tell whether this defines the answer.

'beastly collection' is the wordplay.
'beastly' becomes 'animal' (I've seen this before).
'collection' becomes 'product' (product is a kind of collection).
'animal'+'product'='ANIMAL PRODUCT'

'delivered by' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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