Crossword Genius

False call unknown (6)

Ross

I believe the answer is:

phoney

'false' is the definition.
(thesaurus)

'call unknown' is the wordplay.
'call' becomes 'phone' (phone can mean to call by telephone).
'unknown' becomes 'y' (algebra).
'phone'+'y'='PHONEY'

(Other definitions for phoney that I've seen before include "Fraud" , "Not genuine, insincere" , "Fake, misleading" , "Fraudulent" , "Counterfeit" .)

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