Green piece of lasagna I found (4)
I believe the answer is:
naif
'green' is the definition.
(similar in meaning)
'piece of lasagna i found' is the wordplay.
'piece of' indicates a hidden word.
'NAIF' can be found hidden inside 'lasagna i found'.
(Other definitions for naif that I've seen before include "Green" , "Unsophisticated" , "somewhat ingenuous" , "Artless" , "Innocent" .)