Here one sees planes hover over a river (6)
I believe the answer is:
hangar
'here one sees planes' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'hover over a river' is the wordplay.
'hover' becomes 'hang' (I've seen this before).
'over' says to put letters next to each other.
'river' becomes 'r' (abbreviation for river).
'hang'+'a'+'r'='HANGAR'
Can you help me to learn more?
(Other definitions for hangar that I've seen before include "Structure where aircraft are maintained" , "Aircraft accommodation" , "Cover for aircraft" , "Plane garage" , "Large building to house aircraft" .)