It's true about Mr Gore (4)

I believe the answer is:

real

'it's true' is the definition.
(similar in meaning)

'about mr gore' is the wordplay.
'about' becomes 're' (regarding).
'mr gore' becomes 'Al' (US politician Al Gore).
're'+'al'='REAL'

(Other definitions for real that I've seen before include "Genuine - old Spanish coin" , "Physically existing" , "Not imaginary, genuine" , "'Genuine, actual (4)'" , "The old coin actually exists" .)

I've seen this clue in the Evening Standard.

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