Crossword Genius

Stately surname for Sean, say (4)

Ross

I believe the answer is:

penn

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This clue could be a double definition.

'stately surname' is the first definition.
The definition suggests a singular noun which matches the answer.

'sean say' is the second definition.
The definition suggests a singular noun which matches the answer.

'for' is the link.

Can you help me to learn more?

(Other definitions for penn that I've seen before include "US state (abbrev.)" , "Milk actor" , "founder of colony" , "Colonising Quaker" , "William --, founder of a US state" .)

I've seen this clue in the Evening Standard.
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