Consultant, regularly paid, avoids worry (7)
I believe the answer is:
advisor
'consultant' is the definition.
('advisor' can be a synonym of 'consultant')
'regularly paid avoids worry' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'paid'+'avoids'+'worry'='paidavoidsworry'
The alternating letters of 'paidavoidsworry' are 'ADVISOR'.
(Other definitions for advisor that I've seen before include "consultant" , "Guide; VI roads (anag.)" , "Mentor, counsel" , "one counsels" , "One offers recommendations" .)