Crow bar (5)

I believe the answer is:

roost

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'crow bar?' is the definition.
(I've seen this in another clue)

'crow bar?' is the wordplay.
'crow' becomes 'roos' (I can't justify this - if you can you should give a lot more credence to this answer).
'bar?' becomes 't' (T-bar is a part of a ski lift).
'roos'+'t'='ROOST'

Can you help me to learn more?

(Other definitions for roost that I've seen before include "Bats' settling place" , "Bird's shelter" , "In Orkney, the current" , "Henhouse" , "Perch for a sleeping bird" .)

I've seen this clue in The Globe and Mail, The Washington Post, the Newsday and the LA Times.

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