Spread out; reveal (6)
I believe the answer is:
unfold
This clue is a double definition.
'spread out' is the first definition.
(synonyms)
'reveal' is the second definition.
(I know that unfold is a type of reveal)
(Other definitions for unfold that I've seen before include "Spread out or become known" , "Spread out or become visible" , "Reveal - clarify" , "'O clouds, - - !' (Blake)" , "Open out or reveal gradually" .)