Crossword Genius

Parties containing illegal drugs and second-hand book features (3-4)

Ross

I believe the answer is:

dog-ears

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

'second-hand book features' is the definition.
I can't judge whether this definition defines the answer.

'parties containing illegal drugs' is the wordplay.
'parties' becomes 'dos' (do is a kind of party).
'containing' indicates putting letters inside.
'illegal drugs' becomes 'gear' (I've seen this before).
'dos' placed around 'gear' is 'DOG-EARS'.

'and' is the link.

Can you help me to learn more?

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