Lying hidden (6)
I believe the answer is:
latent
'lying hidden' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for latent that I've seen before include "Concealed - not yet developed" , "Hidden, not manifest" , "Potential, dormant" , "Hidden (talent)" , "Existing but not yet active, say talent" .)