Desire to get into sugar and pepper (7)
I believe the answer is:
cayenne
'pepper' is the definition.
(cayenne is a kind of pepper)
'desire to get into sugar' is the wordplay.
'desire' becomes 'yen' (yen can mean a longing or desire).
'to get into' indicates putting letters inside.
'sugar' becomes 'cane sugar' (cane sugar is a kind of sugar).
'yen' put inside 'cane' is 'CAYENNE'.
'and' acts as a link.
(Other definitions for cayenne that I've seen before include "Type of pepper" , "in kitchen found extremely hot stuff" , "Hot red powdered pepper" , "something hot" , "Very hot, long peppers" .)