Lead boxes contaminate oxygen, substance used in clinical trials (7)
Guardian
Cryptic
#28996
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5 Across
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2023-02-17
Generating...
I haven't cracked this one yet — but the brilliant team at Fifteensquared have:
A charade of PLACEB, an envelope (‘boxes’) of LACE (‘contaminate’) in PB (chemical symbol, ‘lead’); plus O (chemical symbol, ‘oxygen’).