Cash from working aboard boat heading west (5)
I believe the answer is:
krona
'cash' is the definition.
(I've seen this before)
'working aboard boat heading west' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'aboard' is an insertion indicator.
'boat' becomes 'ark' (ark is a kind of boat).
'heading west' is a reversal indicator.
'ark' written backwards gives 'kra'.
'on' placed within 'kra' is 'KRONA'.
'from' acts as a link.
(Other definitions for krona that I've seen before include "Scandinavian bread" , "Money in Stockholm" , "Scandinavian currency" , "Monetary unit of Iceland" , "Monetary unit of Sweden" .)