Discloses that several changes need to be made (7)

I believe the answer is:

reveals

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'discloses' is the definition.
('reveal' can be a synonym of 'disclose')

'several changes need to be made' is the wordplay.
'several' anagrams to 'REVEALS'.
But, I am unsure how this is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for reveals that I've seen before include "Divulges" , "Makes visible" , "Shows" , "Discloses" , "Exposes" .)

I've seen this clue in The Globe and Mail.

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