Crossword Genius

At bottom, a source of support (4)

Ross

I believe the answer is:

seat

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I believe this is a triple definition!

'at bottom' is the first definition.
'seat' can be an answer for 'bottom' (synonyms). I am unsure of the 'at' bit.

'a source' is the second definition.
(I've seen this in another clue)

'of' acts as a link.

'support' is the third definition.
(I know that seat is a type of support)

Can you help me to learn more?

(Other definitions for seat that I've seen before include "pew?" , "Chair - bottom" , "Settle in" , "Place to sit" , "Position (in parliament)" .)

I've seen this clue in the Evening Standard.
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