Repeat virtue regularly shown by judge (7)
I believe the answer is:
iterate
'repeat' is the definition.
(I know that iterate is a kind of repeat)
'virtue regularly shown by judge' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'shown by' says to put letters next to each other.
'judge' becomes 'rate' (rating is a kind of judging).
The alternate letters of 'virtue' are 'ite'.
'ite'+'rate'='ITERATE'
(Other definitions for iterate that I've seen before include "Recapitulate" , "Say again, repeat" , "Utter or perform repeatedly" , "State repeatedly, say again" , "Repeat, state again" .)