Suggestion made in initially dark wood (4)
I believe the answer is:
dash
'suggestion' is the definition.
(thesaurus)
'initially dark wood' is the wordplay.
'initially' indicates taking the first letters.
'wood' becomes 'ash' (wood from an ash tree).
The initial letter of 'dark' is 'd'.
'd'+'ash'='DASH'
'made in' is the link.
(Other definitions for dash that I've seen before include "DOG" , "Hyphen - sprint" , "rats" , "hasty journey" , "Sudden quick run" .)