Sort of rum made with rare rum (8)
I believe the answer is:
demerara
'sort of rum' is the definition.
'made with rare rum' is the wordplay.
'with' says to put letters next to each other.
'rum' indicates an anagram (rum can mean strange or unusual).
'made'+'rare'='maderare'
'maderare' anagrammed gives 'DEMERARA'.
(Other definitions for demerara that I've seen before include "South American river - sugar" , "Variety of sugar" , "Source of sweetness" , "That's sweet!" , "sugar - and alcohol" .)