Free kick is regularly providing natural therapy (5)
I believe the answer is:
reiki
'natural therapy' is the definition.
(type of healing based on natural energies)
'free kick is regularly providing' is the wordplay.
'is regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'providing' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'free'+'kick'='freekick'
The alternating letters of 'freekick' are 'reik'.
'reik'+'i'='REIKI'
(Other definitions for reiki that I've seen before include "therapy" , "Japanese massage" , "Energy healing technique" , "Hands-on treatment" , "Energy-channelling healing technique" .)