Crossword Genius

Sailing on her river (5)

Ross

I believe the answer is:

rhone

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

'river' is the definition.
(I know that Rhone is a river)

'sailing on her' is the wordplay.
'on her' can be anagrammed to 'RHONE'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for rhone that I've seen before include "wherein runs rain in Arbroath" , "French river from Alps to Mediterranean" , "European river and glacier" , "River running from the Swiss Alps to the Mediterranean" , "wine-producing area" .)

I've seen this clue in The Mirror.
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