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Royal Opera House deployed piano only, a real sleep inducer (8)

Ross

I believe the answer is:

rohypnol

'a real sleep inducer' is the definition.
(rohypnol is a sedative drug)

'royal opera house deployed piano only' is the wordplay.
'royal opera house' becomes 'ROH' (abbreviation for Royal Opera House).
'deployed' indicates an anagram.
'piano' becomes 'p'.
'p'+'only'='ponly'
'ponly' anagrammed gives 'ypnol'.
'roh'+'ypnol'='ROHYPNOL'

I've seen this clue in The Times.
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