David Letterman's indolent (4)

I believe the answer is:

idle

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

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

'david letterman's' is the wordplay.
'IDLE' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for idle that I've seen before include "goalless" , "Trivial" , "Not doing much" , "Not hardworking" , "Eric, perhaps" .)

I've seen this clue in The Sun.

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