Regularly find clues not working (4)
I believe the answer is:
idle
'not working' is the definition.
(idle means doing no work)
'regularly find clues' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'find'+'clues'='findclues'
The alternating letters of 'findclues' are 'IDLE'.
(Other definitions for idle that I've seen before include "Do very little" , "Run out of gear" , "Empty" , "not being engaged" , "'Lazy, not doing anything (4)'" .)