Like this clue's number (4)
'like this clue's number' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for even that I've seen before include "That's not odd" , "Level as odds may be" , "happening to take time off?" , "Quits - flat" , "Flat, smooth and divisible by two" .)
(Other definitions for odd that I've seen before include "Casual" , "Matchless" , "Not matching" , "Not even; strange" , "standing out from the crowd?" .)