Praises former Trot less regularly (6)
I believe the answer is:
extols
'praises' is the definition.
(extolling is a kind of praising)
'former trot less regularly' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'trot'+'less'='trotless'
The alternate letters of 'trotless' are 'tols'.
'ex'+'tols'='EXTOLS'
(Other definitions for extols that I've seen before include "'Praises, lauds (6)'" , "Sings the praises of" , "Enthusiastically praises" , "Praises highly, lauds" .)