Goodbye from a French deity (5)
I believe the answer is:
adieu
'goodbye' is the definition.
(synonyms)
'a french deity' is the wordplay.
'french deity' becomes 'dieu' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'dieu'='ADIEU'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for adieu that I've seen before include "Some say it when leaving" , "Farewell (French)" , "the last word in France" , "Vale" , "12 Down" .)