Knocked out Webster lay spread out (7)

I believe the answer is:

bestrew

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'spread out' is the definition.
'bestrew' can be an answer for 'spread' (thesaurus). I'm not sure about the 'out' bit.

'knocked out webster lay' is the wordplay.
'webster' can be anagrammed to 'BESTREW'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for bestrew that I've seen before include "Scatter around as by Webster" , "broadcast?" , "Cover with" , "Lie scattered over (a surface) (literary)" , "Distribute" .)

I've seen this clue in The Globe and Mail.

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