Crossword Genius

Put it under your pillow (7)

Ross

I believe the answer is:

bolster

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'pillow' is the definition.
(bolster is a kind of pillow)

I can't explain the remainder of the clue.

Can you help me to learn more?

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

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