__ noodle (4)
(Other definitions for pool that I've seen before include "Mere - game" , "Pond; table game" , "In which to see water" , "Puddle - game with balls" , "Game played on a table with six pockets" .)
'noodle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nob that I've seen before include "A slangy person of high rank - c'est bon" , "A slang toff - c'est bon" , "A slangy head" , "Person of wealth or high social position" , "A posh gent - c'est bon" .)