Crossword Genius

Paid a charge to get a grass border (8)

Ross

I believe the answer is:

rewarded

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'paid a charge' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'to get a grass border' is the wordplay.
'to get' becomes 're' (I've seen this in other clues).
'a grass border' becomes 'warded' (I can't explain this - if you can you should believe this answer much more).
're'+'warded'='REWARDED'

Can you help me to learn more?

(Other definitions for rewarded that I've seen before include "Offered something for a service or achievement" , "Honoured" , "profiting by it" , "Given something in recognition of effort" , "Recompensed for service" .)

I've seen this clue in the Evening Standard.
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