Article in wood is parking light seen at night (4-1-3-4)
I believe the answer is:
will-o-the-wisp
'light seen at night' is the definition.
(glowing light in folklore)
'article in wood is parking' is the wordplay.
'article' becomes 'the' (the definite article in English).
'in' indicates putting letters inside.
'wood' becomes 'willow' (willow is a type of tree).
'parking' becomes 'p' (abbreviation on road signs).
'willow'+'is'+'p'='willowisp'
'the' placed inside 'willowisp' is 'WILL-O-THE-WISP'.
(Other definitions for will-o-the-wisp that I've seen before include "(Treacherous) marsh light" , "Optical illusion" , "Elusive person" , "Phosphorescent light seen over marshy ground at night" , "Person or thing impossible to catch" .)