Crossword Genius

Some bedlinen he's put outside (5)

Ross

I believe the answer is:

sheet

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'some bedlinen he's put outside' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'he's put outside' is the wordplay.
'put' becomes 'set' (synonyms).
'outside' indicates putting letters inside.
'he' put inside 'set' is 'SHEET'.

Can you help me to learn more?

(Other definitions for sheet that I've seen before include "Page of postage stamps" , "Piece of paper; nautical rope" , "Item of bed linen like these" , "* [MATERIAL]" , "Bed cover" .)

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