Thugs regularly given blow and grass (7)
I believe the answer is:
tussock
'grass' is the definition.
(I've seen this before)
'thugs regularly given blow' is the wordplay.
'regularly given' means one should take alternating letters.
'blow' becomes 'sock' (I have seen 'Hard blow ' mean 'sock' so perhaps 'blow' could also mean 'sock').
The alternate letters of 'thugs' are 'tus'.
'tus'+'sock'='TUSSOCK'
'and' acts as a link.
(Other definitions for tussock that I've seen before include "Tuft of grass" , "Clump of hair" , "(Of grass) cut" , "Grassy clump" , "Thick patch of grass" .)