Crossword Genius

School tests, I'm thinking, are in Mandarin (7)

Ross

I believe the answer is:

satsuma

I'm a little stuck... Click here to teach me more about this clue!

'mandarin' is the definition.
(I know that satsuma is a type of mandarin)

'school tests i'm thinking are' is the wordplay.
'school tests' becomes 'SATs' (scholastic assessment tests in the UK).
'i'm thinking' becomes 'um' (I can't justify this - if you can you should believe this answer much more).
'are' becomes 'a' (short for 'are', historical unit of measurement).
'sats'+'um'+'a'='SATSUMA'

'in' is the link.

Can you help me to learn more?

(Other definitions for satsuma that I've seen before include "Citrus fruit from Japan" , "Easy-peeling tangerine" , "Small, easily-peeled orange" , "A small citrus fruit" , "Citrus tree named after an old Japanese province" .)

I've seen this clue in The Guardian.
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