Girl, it’s said, is one of eight on river maybe (4)

I believe the answer is:

rows

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'one of eight on river maybe' is the definition.
I can't judge whether this definition defines the answer.

'girl it's said' is the wordplay.
'girl' becomes 'Rose'.
'it's said' indicates a 'sounds like' (homophone) clue.
'rose' sounds like 'ROWS'.

'is' is the link.

Can you help me to learn more?

(Other definitions for rows that I've seen before include "Scraps" , "Arrangements side by side in lines" , "Banks" , "Tiers" , "Angry disputes" .)

I've seen this clue in The Times.

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