As a big star, was he able to brag? (6)

I believe the answer is:

bogart

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'as a big star was he able' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'to brag?' is the wordplay.
'to brag' anagrams to 'BOGART'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for bogart that I've seen before include "Humphrey --, US film actor" , "See 12" , "American actor" , "Lauren Bacall's first actor husband, d. 1957" , "Famous player" .)

I've seen this clue in the Evening Standard.

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