Boatmen transporting old signore (10)

I believe the answer is:

gondoliers

I'm a little stuck... Click here to teach me more about this clue!

'boatmen' is the definition.
(gondolier is a kind of boatman)

'transporting old signore' is the wordplay.
'old signore' anagrams to 'GONDOLIERS'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for gondoliers that I've seen before include "Operatic boatmen?" , "G & S' alternative for "The King of Barataria"" , "Venice boatmen" , "Craftsmen" , "Venetian boatmen" .)

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