Crossword Genius

Words get muddled at end of day when tired (6)

Ross

I believe the answer is:

drowsy

I'm a little stuck... Click here to teach me more about this clue!

'tired' is the definition.
(I've seen this before)

'words get muddled at end of day' is the wordplay.
I cannot quite see how this works, but
an anagram of 'words' is 'drows' which is present in the answer.
A single letter 'y' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'when' acts as a link.

Can you help me to learn more?

(Other definitions for drowsy that I've seen before include "Dull" , "Almost asleep" , "Disinclined to stay awake" , "liable to drop off" , "Sleepy, half-asleep" .)

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