Crossword Genius

A drug forming rock, perhaps (8)

Ross

I believe the answer is:

asteroid

'rock perhaps' is the definition.
(rock in space)

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

'forming' is the link.

(Other definitions for asteroid that I've seen before include "circling rock" , "Rocky body in orbit" , "Lump of rock orbiting the sun" , "Small celestial body moving around the sun" , "Ceres, say" .)

I've seen this clue in The Telegraph.
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