Regularly turnout for jog (4)
I believe the answer is:
trot
'for jog' is the definition.
(synonyms)
'regularly turnout' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'turnout' are 'TROT'.
(Other definitions for trot that I've seen before include "Clip (horse)" , "(Horse's) moderate pace" , "Left-winger - move at a fair speed" , "Go or walk briskly" , "Run (like a horse)" .)