It partially hides Tim's confusion (4)

I believe the answer is:

mist

'it partially hides' is the definition.
(mist might partially block things from view)

'tim's confusion' is the wordplay.
'confusion' indicates anagramming the letters.
'tims' is an anagram of 'MIST'.

(Other definitions for mist that I've seen before include "Mizzle; light rain" , "Fine spray" , "Think fog or low cloud" , "Cloud; thin fog" , "Haze" .)

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

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