Crossword Genius

Something to read on cracking theme with vessel after vessel (5,3,2,1,4)

Ross

I believe the answer is:

three men in a boat

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

'something to read' is the definition.
(novel by Jerome K Jerome)

'on cracking theme with vessel after vessel' is the wordplay.
I cannot really understand how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the answer.
'vessel' could be 'nina' (La Nia, ship in Christopher Columbus' fleet) and 'nina' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for three men in a boat that I've seen before include "Funny story" , "Work" , "George, Harris and Jerome K. Jerome" , "Novel of Thames travellers (5,3,2,1,4)" , "Victorian book" .)

I've seen this clue in The Guardian.
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