Specialised market in organic hemp (5)
I believe the answer is:
niche
'specialised market' is the definition.
(I've seen this before)
'in organic hemp' is the wordplay.
'in' says the answer is hidden in the clue.
'NICHE' can be found hidden inside 'organic hemp'.
(Other definitions for niche that I've seen before include "good spot!" , "Recess; comfy corner" , "Comfortable position" , "Speciality" , "Cosy corner?" .)