Lord from Dusseldorf made a mountain out of a molehill (6)
I believe the answer is:
fussed
'a mountain out of a molehill' is the definition.
I can't judge whether this definition defines the answer.
'lord from dusseldorf made' is the wordplay.
'from' indicates named letters should be taken away.
'made' is an anagram indicator.
'dusseldorf' with 'lord' taken away is 'ussedf'.
'ussedf' anagrammed gives 'FUSSED'.
Can you help me to learn more?
(Other definitions for fussed that I've seen before include "Worried" , "Fretted" , "Made unnecessary display about unimportant matter" .)