Positive response given to Germany's colours (4)
I believe the answer is:
dyes
'colours' is the definition.
(dyeing is a kind of colouring)
'positive response given to germany's' is the wordplay.
'positive response' becomes 'yes' (I've seen this before).
'given to' says to put letters next to each other.
'germany' becomes 'd' (international vehicle registration code).
'yes' after 'd' is 'DYES'.
(Other definitions for dyes that I've seen before include "Colours (fabric)" , "Stains" , "turns green, possibly" , "Colour" , "Substances for staining or colouring" .)