Below C level? (4)
I believe the answer is:
poor
'below c level?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for poor that I've seen before include "Badly off - inferior in quality" , "Penniless" , "'It's a . . . . heart that never rejoices'" , "Without means" , "Shoddy" .)