9 across
Like
0,
nothing
(0)
divides
51500
(5)
Like 0, nothing (0) divides 51500 (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Like 0 means egg-shaped or oval. Start with O for 'nothing', then build VOID by taking V, I and D (the Roman numerals for 5, 1 and 500, i.e. '51500') and inserting another O ('nothing') into them — 'divides' is the container indicator. Stick it all together: O-V-O-I-D.