Little Christopher’s gear (3)
I believe the answer is:
kit
'gear' is the definition.
(I know that kit is a type of gear)
'little christopher's' is the wordplay.
'little' means to remove the last letter (the word is not quite complete).
'christopher's' becomes 'Kit's' (short for Christopher).
'kits' with its final letter removed is 'KIT'.
(Other definitions for kit that I've seen before include "Equipment, clothing" , "Young cat" , "Colours are visible on such" , "Football top, shorts, stockings and boots?" , "Supplies" .)