Great trouble for the volunteers at Henley, for example (7)

I believe the answer is:

regatta

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'henley for example' is the definition.
I can't tell whether this defines the answer.

'great trouble for the volunteers' is the wordplay.
'trouble' indicates an anagram.
'for' means one lot of letters go next to another.
'the volunteers' becomes 'TA' (abbreviation for Territorial Army).
'great' is an anagram of 'regat'.
'regat'+'ta'='REGATTA'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for regatta that I've seen before include "Yachting or rowing event" , "Yacht-racing event" , "Number of yachts in sporting event" , "races at sea" , "Rowing, sailing, gala" .)

I've seen this clue in The Irish Independent.

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