Tick electronic list when fit for sale (10)
I believe the answer is:
marketable
'fit for sale' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?
'tick electronic list' is the wordplay.
'tick' becomes 'mark' (I am not sure about this - if you are sure you should believe this answer much more).
'electronic' becomes 'e' (as in e-mail or e-books).
'list' becomes 'table' (list can mean a table or chart).
'mark'+'e'+'table'='MARKETABLE'
'when' is the link.
Can you help me to learn more?
(Other definitions for marketable that I've seen before include "likely to sell" , "Fit to be sold" , "Fit for sale; in demand" , "like hot cakes, especially" , "appropriate for sale" .)