Malodorous coloured liquid filling malodorous place (6)
I believe the answer is:
stinky
'malodorous' is the definition.
(I know that malodorous can be written as stinky)
'coloured liquid filling malodorous place' is the wordplay.
'coloured liquid' becomes 'ink'.
'filling' indicates putting letters inside.
'malodorous place' becomes 'sty' (I've seen this in another clue).
'ink' put within 'sty' is 'STINKY'.
(Other definitions for stinky that I've seen before include "Odoriferous" , "Humming" , "Foul-smelling" , "high" , "Having an unpleasant smell" .)