Lacking the resources (6)
I believe the answer is:
unable
'lacking the resources' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for unable that I've seen before include "Not capable" , "Incompetent sort of nebula" , "Incompetent or powerless" , "Lacking the required capacity" , "Lacking the necessary skills" .)