Wimp regularly paired with bully (6)
I believe the answer is:
coward
'wimp' is the definition.
(I've seen this before)
'regularly paired with bully' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'with' says to put letters next to each other.
'bully' becomes 'cow' (cow can mean to bully or oppress).
The alternating letters of 'paired' are 'ard'.
'ard' put after 'cow' is 'COWARD'.
(Other definitions for coward that I've seen before include "who would shy away from difficulties?" , "Author of 'Blithe Spirit'" , "Scaredy-cat" , "Person who is deficient in courage" , "Noel . . . . . ., English playwright and actor" .)