Bag of cash confused alien (6)
I believe the answer is:
sachet
'bag' is the definition.
(sachet is a kind of bag)
'cash confused alien' is the wordplay.
'confused' indicates anagramming the letters.
'alien' becomes 'et' (extra terrestrial).
'cash' anagrammed gives 'sach'.
'sach'+'et'='SACHET'
'of' is the link.
(Other definitions for sachet that I've seen before include "Small envelope-like container" , "Small bag or sealed plastic pack" , "Small packet (of, eg, shampoo)" , "'Small soft bag, for perfumed powder say (6)'" , "Package" .)