Unlike pirates, a duke must be well turned out (9)
I believe the answer is:
disparate
'unlike' is the definition.
(thesaurus)
'pirates a duke must be well turned out' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
an anagram of 'pirates' is 'isprate' which is present in the left over letters.
'duke' could be 'd' and 'd' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for disparate that I've seen before include "Quite different" , "Contrasting" , "Including elements very different from one another" .)