Crossword Genius

Here one sees planes hover over a river (6)

Ross

I believe the answer is:

hangar

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Sun.
Want a hint initially instead of a full solution? Install my app