Crusoe cast adrift without source of soap and sugar … (7)
I believe the answer is:
sucrose
'sugar' is the definition.
(synonyms)
'crusoe cast adrift without source of soap' is the wordplay.
I cannot really see how this works, but
an anagram of 'crusoe' is 'ucrose' which is located in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for sucrose that I've seen before include "Basis of cane sugar" , "Sweet substance" , "Chief component of cane or beet sugar" , "Main part of cane sugar" , "Sweetener" .)