Thief (rhyming slang) (3,4)
(Other definitions for tea leaf that I've seen before include "Light-fingered East Ender" , "one of many going to pot?" , "Part of plant used to make drink" , "Darjeeling?" , "ending up in hot water" .)
(Other definitions for tealeaf that I've seen before include "nicker" , "thief" .)