Tonsil, ear, sinus, back: that’s too much for certain people! (8)
I believe the answer is:
israelis
'certain people' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'tonsil ear sinus back that's too much' is the wordplay.
'that's too much' indicates a hidden word (the clue hides the answer plus unneeded letters).
'back' says the letters should be written in reverse.
'silearsi' is hidden in the letters of 'tonsil ear sinus'.
'silearsi' in reverse letter order is 'ISRAELIS'.
'for' is the link.
Can you help me to learn more?
(Other definitions for israelis that I've seen before include "people in Middle East" , "Citizens of a modern MiddleEastern state" , "They might live in 4 down" , "people from the Med?" , "They might live in Tel Aviv, say" .)