Insubstantial, paltry (6)
I believe the answer is:
meagre
This clue is a double definition.
'insubstantial' is the first definition.
(I've seen this before)
'paltry' is the second definition.
(similar in meaning)
(Other definitions for meagre that I've seen before include "Poor in quality" , "Lean, thin" , "Small, insufficient" , "unsatisfactorily small in amount" , "Thin or scanty" .)