John —, US president (5)

I believe the answer is:

adams

I believe this is a double definition.

'john' is the first definition.
(I've seen this in another clue)

'us president' is the second definition.
(I've seen this before)

(Other definitions for adams that I've seen before include "Name of two early US presidents" , "Gaolers" , "American composer" , "revolutionary leader" , "Former US president" .)

I've seen this clue in The Telegraph and The Times.

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