He sits in silence (3)

I believe the answer is:

len

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'he sits' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'in silence' is the wordplay.
'in' says the answer is hidden in the clue.
'LEN'' is hidden in the letters of 'silence'.

Can you help me to learn more?

(Other definitions for len that I've seen before include "- - Hutton, cricketer" , "Sir - - Hutton" , "-- Deighton, author" , "Boy" , "Leonard (dim.)" .)

I've seen this clue in the Evening Standard.

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