Evasive; hard to hold (8)
I believe the answer is:
slippery
This clue is a double definition.
'evasive' is the first definition.
(I've seen this before)
'hard to hold' is the second definition.
(I've seen this in another clue)
(Other definitions for slippery that I've seen before include "Hard to grasp, like an eel" , "Descent into sin in this sort of slope" , "Untrustworthy" , "Hard to grasp or walk on" , "Evasive, elusive" .)