Wrong for the situation (5)
I believe the answer is:
inapt
'wrong for the situation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for inapt that I've seen before include "Not proper" , "Not suitable or appropriate" , "Useless" , "Ill-chosen, not suitable" , "Not fit, unsuitable" .)