DIN or new ISO designed by Europe (5)
I believe the answer is:
noise
'din' is the definition.
(I've seen this before)
'new iso designed by europe' is the wordplay.
'new' becomes 'n'.
'designed' is an anagram indicator (designed with the letters).
'by' means one lot of letters go next to another.
'europe' becomes 'e' (this might be a standard abbreviation I've not previously seen).
'iso' anagrammed gives 'ois'.
'n'+'ois'+'e'='NOISE'
'or' is the link.
Can you help me to learn more?
(Other definitions for noise that I've seen before include "Kind of pollution" , "Confused sounds" , "interference" , "Static - sound" , "Rumour" .)