Having no current or flow (8)
I believe the answer is:
stagnant
'having no current or flow' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for stagnant that I've seen before include "Moribund" , "Foul from inertia" , "Still and foul" , "Showing little activity" , "(Water) not flowing" .)