Earl tends to procrastinate. Lost pen? (10)

I believe the answer is:

aristocrat

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

'earl' is the definition.
(thesaurus)

'tends to procrastinate lost pen?' is the wordplay.
I cannot quite see how this works, but
'to' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for aristocrat that I've seen before include "Nobleman" , "What's listed in Debrett" , "Nob" , "Member of the nobility" , "Member of the upper class" .)

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

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