Without meaning (9)
I believe the answer is:
senseless
'without meaning' is the definition.
('meaning' can be 'sense' (sense is a kind of meaning) so maybe 'without meaning' can be ''senseless')
This is the entire clue.
(Other definitions for senseless that I've seen before include "Without meaning or purpose" , "Wildly foolish" , "Mindless, pointless" , "Inane" , "Out cold" .)