Man left out new sort for conductor (7)

I believe the answer is:

maestro

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'for conductor' is the definition.
(I've seen this before)

'man left out new sort' is the wordplay.
'man left out' becomes 'mae' (I can't justify this - if you can you should believe this answer much more).
'new' is an anagram indicator.
'sort' with letters rearranged gives 'stro'.
'mae'+'stro'='MAESTRO'

Can you help me to learn more?

(Other definitions for maestro that I've seen before include "hotshot" , "special performer" , "Famous conductor" , "Top player" , "Artist of consummate skill: conductor" .)

I've seen this clue in The Daily Express.

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