Crossword Genius

Unlock to reveal (8)

Ross

I believe the answer is:

I believe this clue is a double definition.

'unlock' is the first definition.
(thesaurus)

'reveal' is the second definition.
(disclosing is a kind of revealing)

'to' acts as a link.

(Other definitions for disclose that I've seen before include "Lay bare", "Divulge or expose", "Uncover", "Reveal, expose to view", "Divulge, reveal".)