John, able to sing lento (5)

I believe the answer is:

elton

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'john' is the definition.
(musician Elton John)

'able to sing lento' is the wordplay.
'lento' can be anagrammed to 'ELTON'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for elton that I've seen before include "First name of singer/songwriter born Reginald Dwight in 1947" , "Sir ___ John, singer-songwriter" , "- John, British singer" , ". . . . . John (musician)" , "..... Jonn (musician)" .)

I've seen this clue in the Evening Standard.

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