Crossword Genius

Statement from UK spying agency (6)

Ross

I believe the answer is:

thesis

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'statement' is the definition.
(thesis is a kind of statement)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for thesis that I've seen before include "A lengthy essay, perhaps for degree" , "He sits (anag) - treatise" , "Long research essay or treatise written for university degree" , "theory" , "Learned dissertation" .)

I've seen this clue in The Times.
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