Visit parts of Mar-a-lago on a backwater (6)
I believe the answer is:
lagoon
'visit parts of mar-a-lago on a backwater' is the definition.
I can't tell whether this definition defines the answer.
'lago on a backwater' is the wordplay.
'on' is a charade indicator (letters next to each other).
'a backwater' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
'lago'+'on'='LAGOON'
Can you help me to learn more?
(Other definitions for lagoon that I've seen before include "Shallow salt-water lake" , "small lake" , "Water protected by a coral reef" , "Stretch of water inside coral reef or sandbank" , "Salt water lake surrounded by reef or sand" .)