Crossword Genius

Polyhedron on board problem sir put up (5)

Ross

I believe the answer is:

prism

'polyhedron' is the definition.
(prism is a kind of polyhedron)

'on board problem sir put up' is the wordplay.
'on board' indicates a hidden word (the answer is contained by or 'on board' the clue).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'msirp' is hidden within 'problem sir put'.
'msirp' reversed gives 'PRISM'.

(Other definitions for prism that I've seen before include "What's on Dark Side of the Moon" , "Glass triangle that separates white light into the colour spectrum" , "something that colours views?" , "Light transmitter" , "Transparent solid for dispersing light" .)

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