Long cushion provides help (7)

I believe the answer is:

bolster

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This clue could be a double definition.

'long cushion' is the first definition.
'bolster' can be an answer for 'cushion' (bolster is a kind of cushion). I'm unsure of the 'long' bit.

'help' is the second definition.
(thesaurus)

'provides' is the link.

Can you help me to learn more?

(Other definitions for bolster that I've seen before include "Reinforce; a cushion" , "Prop up with long pillow" , "Strengthen - long pillow" , "Hold up" , "Support - strengthen" .)

I've seen this clue in The Independent.

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