Those producing tattoos mark right part of leg (9)
I believe the answer is:
drumstick
'part of leg' is the definition.
('drumstick' is part of 'leg')
'those producing tattoos mark right' is the wordplay.
'those producing tattoos' becomes 'drums' (a tattoo is a military drum beat).
'mark right' becomes 'tick' (to tick something is to mark it correct or right).
'drums'+'tick'='DRUMSTICK'
(Other definitions for drumstick that I've seen before include "What beats" , "a bit of leg?" , "sometimes used in a roll" , "Chicken leg (for a percussionist?)" , "Tibia of dressed fowl" .)