Great at arranging water sports (7)

I believe the answer is:

regatta

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'water sports' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'great at arranging' is the wordplay.
'arranging' indicates an anagram.
'great'+'at'='greatat'
'greatat' is an anagram of 'REGATTA'.

Can you help me to learn more?

(Other definitions for regatta that I've seen before include "Sailing races" , "Display of boats" , "Race meeting for boats" , "Boat festival" , "Yachting festival" .)

I've seen this clue in The Globe and Mail.

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