I'm leaving you symbolically beside a drop (5)
I believe the answer is:
adieu
'i'm leaving you symbolically' is the definition.
I can't judge whether this defines the answer.
'beside a drop' is the wordplay.
'beside' says to put letters next to each other.
'drop' becomes 'dieu' (I can't justify this - if you can you should give a lot more credence to this answer).
'a' next to 'dieu' is 'ADIEU'.
Can you help me to learn more?
(Other definitions for adieu that I've seen before include "Bye" , "Farewell to France" , "Cheerio" , "Goodbye, mon ami!" , "Gallic goodbye" .)