Thick section of wooden seat (5)

I believe the answer is:

dense

'thick' is the definition.
('dense' can be a synonym of 'thick')

'section of wooden seat' is the wordplay.
'section of' says the answer is hidden in the clue.
'DENSE' is hidden within 'wooden seat'.

(Other definitions for dense that I've seen before include "Needs (anag) -- thick" , "Thick; stupid" , "Not very bright" , "Stupid, crowded together" , "Thick, impenetrable" .)

I've seen this clue in The Times.

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