This uses a container clue combined with a homophone. A container clue means one word goes inside another word, and a homophone means a word that sounds like another word.
"Say" indicates a homophone - find a word that sounds like "tea". Then look for "something to eat with" that can contain this sound-alike word. "Coming in" tells you the homophone goes inside the other word.
Answer: SPOT ON | "Say" signals homophone: T sounds like "tea". "Something to eat with" = SPOON. T goes inside SPOON ("coming in") = SP(T)OON, but rearranged gives SPOT ON meaning "exactly".