Thick part of a garden seat (5)

I believe the answer is:

dense

'thick' is the definition.
(I know that thick can be written as dense)

'part of a garden seat' is the wordplay.
'part of' indicates a hidden word.
'DENSE' is hidden within 'garden seat'.

(Other definitions for dense that I've seen before include "Obtuse - impenetrable" , "Tightly packed - stupid" , "Stupid, crowded together" , "Close-knit" , "Close - compact - stupid" .)

I've seen this clue in the Evening Standard.

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