What people do when they retire makes one wild (3,4)

I believe the answer is:

lie down

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'what people do when they retire' is the definition.
The definition suggests a singular noun but the answer is not.

'makes one wild' is the wordplay.
'makes' indicates anagramming the letters.
'one'+'wild'='onewild'
'onewild' is an anagram of 'LIE-DOWN'.

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(Other definitions for lie down that I've seen before include "Put your feet up" , "Take a rest (at length!)" , "Become 14" , "Assume recumbent position" , "Now idle (anag) -- short rest" .)

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

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