Major successor Libra influenced (5)

I believe the answer is:

blair

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'major successor' is the definition.
(I've seen this in another clue)

'libra influenced' is the wordplay.
'libra' anagrams to 'BLAIR'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for blair that I've seen before include "Tony ..., modern P.M." , "George Orwell's actual family name" , "See 3" , "5,27 [PRIME MINISTER]" , "former leader" .)

I've seen this clue in The Sun.

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