Crossword Genius

Rowers go under multiple times (9)

Ross

I believe the answer is:

eightfold

I'm a little stuck... Click here to teach me more about this clue!

'rowers go under multiple times' is the definition.
I can't tell whether this defines the answer.

'rowers go under' is the wordplay.
'rowers' becomes 'eight' (eight can mean a crew of eight rowers).
'go under' becomes 'fold' (I've seen this in another clue).
'eight'+'fold'='EIGHTFOLD'

Can you help me to learn more?

(Another definition for eightfold that I've seen is " Size of increase".)

I've seen this clue in The Independent.
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