Lacking the wherewithal (6)
I believe the answer is:
unable
'lacking the wherewithal' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for unable that I've seen before include "Not in a position (to)" , "Not capable" , "Old, weak" , "Not having sufficient power" , "Not having the necessary means or skill or know-how" .)