Crossword Genius

Amount in Student Union: million (3)

Ross

I believe the answer is:

sum

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

'amount' is the definition.
(I know that amount can be written as sum)

'student union million' is the wordplay.
'student' becomes 's' (this could be a standard abbreviation which I don't know about).
'union' becomes 'U' (common abbreviation as in 'Trades Union Congress').
'million' becomes 'm' (abbreviation).
's'+'u'+'m'='SUM'

'in' is the link.

Can you help me to learn more?

(Other definitions for sum that I've seen before include "Add together" , "Arithmetic calculation" , "Total; problem" , "Amount of money; total" , "Total, add" .)

I've seen this clue in The Sun.
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