Gardening trough designed for catchment area (9-6)

I believe the answer is:

gathering-ground

'catchment area' is the definition.

'gardening trough designed' is the wordplay.
'designed' is an anagram indicator (designed with the letters).
'gardening'+'trough'='gardeningtrough'
'gardeningtrough' is an anagram of 'GATHERING GROUND'.

'for' acts as a link.

I've seen this clue in The Telegraph.

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