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Planes kept here hover by a river (6)

Ross

I believe the answer is:

hangar

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'planes kept here' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'hover by a river' is the wordplay.
'hover' becomes 'hang' (I've seen this before).
'by' means one lot of letters go next to another.
'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 "Airfield building" , "storage location" , "Large shed to house aircraft" , "Airport shed" , "Large structure for housing aircraft" .)

I've seen this clue in The Sun.
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