State, in brief, that William was a Quaker (4)

I believe the answer is:

penn

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This could be a double definition.

'state in brief that william was a' is the first definition.
'penn' can be an answer for 'state' (abbreviation for Pennsylvania). I am not certain of the remainder of the definition.

'quaker' is the second definition.
(Quaker and founder of Pennsylvania William Penn)

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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