Not clearly expressed (12)
I believe the answer is:
inarticulate
'not clearly expressed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for inarticulate that I've seen before include "Not clearly expressed" , "Lacking fluency" , "I taunt a relic (anag.)" , "Unable to express oneself clearly" , "Tongue-tied" .)