Crossword Genius

Lad tunes out, having inhaled good hallucinogen (5,4)

Ross

I believe the answer is:

angel dust

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

'hallucinogen' is the definition.
(angel dust is a kind of hallucinogen)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for angel dust that I've seen before include "Drug" , "Hallucinogen - stale dung (anag)" .)

I've seen this clue in The Independent.
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