Talks about river, providing maps (6)
I believe the answer is:
charts
'maps' is the definition.
(chart is a kind of map)
'talks about river providing' is the wordplay.
'talks' becomes 'chats' (I've seen this before).
'about' means one lot of letters goes inside another.
'river providing' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'chats' going around 'r' is 'CHARTS'.
Can you help me to learn more?
(Other definitions for charts that I've seen before include "Maps for ship's captain" , "Maps to aid navigation" , "Maps; plans" , "Starch (anag)" , "Maps to assist navigation by air or sea" .)