A cash incentive has charm (6)
I believe the answer is:
allure
'charm' is the definition.
(I've seen this in another clue)
'a cash incentive' is the wordplay.
'cash' becomes 'L' (The pound sterling symbol is an elaborate L).
'incentive' becomes 'lure' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'l'+'lure'='ALLURE'
'has' is the link.
Can you help me to learn more?
(Other definitions for allure that I've seen before include "Attractiveness, glamour" , "The power to entice or attract" , "Seduce" , "Charm, magnetism" , "Laurel (anag)" .)