Unexpectedly discloses the sources (7)

I believe the answer is:

springs

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This might be a double definition.

'unexpectedly discloses' is the first definition.
'springs' can be an answer for 'discloses' (springing is a kind of disclosing). I'm unsure of the 'unexpectedly' bit.

'the sources' is the second definition.
(spring is a kind of source)

Can you help me to learn more?

(Other definitions for springs that I've seen before include "Natural flows of ground water" , "what might be after Alice?" , "Elastic metal coils" , "Jumps; metal coils" .)

I've seen this clue in the Evening Standard.

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