Some found nervously lying in a cunning way (5)
I believe the answer is:
slyly
'in a cunning way' is the definition.
(I know this)
'some found nervously lying' is the wordplay.
'some found' indicates a hidden word.
'SLYLY' is hidden within 'nervously lying'.
(Other definitions for slyly that I've seen before include "In a stealthy and secret way" , "Craftily, cunningly" , "In a cunning manner" , "in underhand way" .)