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' can be anagrammed to 'GONDOLIERS'.
However, I'm not sure 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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