Crossword Genius

A drug rock (8)

Ross

I believe the answer is:

asteroid

'rock' is the definition.
(an asteroid is a rock in space)

'a drug' is the wordplay.
'drug' becomes 'steroid' (type of drug).
'a'+'steroid'='ASTEROID'

(Other definitions for asteroid that I've seen before include "Small celestial body moving around the sun" , "Bits of rock that move around the heavens" , "Piece of rock that moves around the heavens" , "Small body orbiting sun" , "circling rock" .)

I've seen this clue in The Sunday Times and The Times.
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