Tip left among snooker equipment (4)
I believe the answer is:
clue
'tip' is the definition.
(I've seen this in other clues)
'left among snooker equipment' is the wordplay.
'left' becomes 'l' (common abbreviation).
'among' indicates putting letters inside.
'snooker equipment' becomes 'cue' (stick used when playing snooker).
'l' inserted inside 'cue' is 'CLUE'.
(Other definitions for clue that I've seen before include "Inkling" , "Intimation (like this?)" , "Hint; piece of evidence" , "Crossword help" , "Luce (anag.)" .)