Small number dividing 1,002 (4)
I believe the answer is:
mini
'small' is the definition.
(short for miniature)
'number dividing 1002' is the wordplay.
'number' becomes 'n' (n can represent any number).
'dividing' indicates putting letters inside (inserted letters divide the word).
'n002' becomes 'mii' (I've seen this in another clue).
'n' placed within 'mii' is 'MINI'.
(Other definitions for mini that I've seen before include "Baby" , "Iconic economy car (introduced in 1959)" , "Brief" , "Car; short dress" , "Small (of car, skirt, disk,bar or series)" .)