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 they can define each other.

'he's put outside' is the wordplay.
'put' becomes 'set' (both can mean to place or position).
'outside' means one lot of letters goes inside another (some letters go outside others).
'he' going within '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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