Some are altogether genuine (4)

I believe the answer is:

real

'genuine' is the definition.
('real' is associated in meaning with 'genuine')

'some are altogether' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'REAL' can be found hidden inside 'are altogether'.

(Other definitions for real that I've seen before include "Actually existing" , "The old coin actually exists" , "Actual; Brazilian currency" , "Unaffected" , "Actual, existing" .)

I've seen this clue in The Times.

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