Some of the symbols terminate support (7)

I believe the answer is:

bolster

'support' is the definition.
(I know that bolster is a more specific form of the action prop)

'some of the symbols terminate' is the wordplay.
'some of' says the answer is hidden in the clue.
'BOLSTER' is hidden within 'symbols terminate'.

(Other definitions for bolster that I've seen before include "Support - strengthen" , "Long thick pillow" , "Provide reinforcement" , "Chisel - long cushion" , "Support; long pillow" .)

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

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