Nominally a piece of stale news (3)

I believe the answer is:

len

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'nominally a piece' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'of stale news' is the wordplay.
'of' indicates the answer is hidden within the clue.
'LEN'' can be found hidden inside 'stale news'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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