Money to make fast fell over time (7)

I believe the answer is:

moorage

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'money to make fast' is the definition.
I can't judge whether this definition defines the answer.

'fell over time' is the wordplay.
'fell' becomes 'moor' (both can mean an expanse of wild land).
'over' is a charade indicator (letters next to each other).
'time' becomes 'age' (an age is a period of time).
'moor'+'age'='MOORAGE'

Can you help me to learn more?

(Other definitions for moorage that I've seen before include "Securing of craft" , "Place for a ship to make fast" , "Making fast" , "Place to fasten" , "Charge for tying up a ship" .)

I've seen this clue in The Guardian.

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