Parked bottom in glossy fabric (5)

I believe the answer is:

satin

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

'parked bottom in' is the wordplay.
'parked bottom' becomes 'sat' (I am not sure about this - if you are sure you should believe this answer much more).
'sat'+'in'='SATIN'

Can you help me to learn more?

(Other definitions for satin that I've seen before include "Glossy textile" , "Silk fabric" , "Smooth glossy fabric" , "Stain found in cloth" , "Shiny solk" .)

I've seen this clue in the Sydney Morning Herald.

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