Slow, corpulent old members (5)

I believe the answer is:

lento

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'slow' is the definition.
(similar in meaning)

'corpulent old members' is the wordplay.
'LENTO' is hidden within the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for lento that I've seen before include "Old sayings" , "Scored slowly" , "How one scores slowly" , "Instruction to players" , "Slow musically" .)

I've seen this clue in the Sydney Morning Herald.

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