County season, we hear, prescribed (8)

I believe the answer is:

somerset

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'county' is the definition.
(I've seen this before)

'season we hear prescribed' is the wordplay.
I cannot really understand how this works, but
'prescribed' could be 'set' (I've seen this before) and 'set' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for somerset that I've seen before include "... and another" , "SW county" , "Rome sets up in this English county" , "Old English county" , "part of south-west England" .)

I've seen this clue in The Times.

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