Tel Aviv school's thrashing is heavy (7)
I believe the answer is:
yeshiva
'tel aviv' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?
'school's thrashing is heavy' is the wordplay.
'is heavy' can be anagrammed to 'YESHIVA'.
Though, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for yeshiva that I've seen before include "Orthodox Jewish seminary - is heavy (anag)" , "Talmud study" , "Jewish school" , "Orthodox Jewish college" , "School of religion" .)