Tempt steady uncle at regular intervals (6)
I believe the answer is:
seduce
'tempt' is the definition.
(I know that seduce is a more specific form of tempt)
'steady uncle at regular intervals' is the wordplay.
'at regular intervals' indicates alternate letters.
'steady'+'uncle'='steadyuncle'
The alternating letters of 'steadyuncle' are 'SEDUCE'.
(Other definitions for seduce that I've seen before include "Lead astray, corrupt" , "mislead" , "Charm - deprave" , "Win over" , "Lead astray, tempt" .)