Remarkable race, perhaps, dashes in the middle; boat and fish (5,5,5)

'fish' is the definition.
(great white shark is a kind of fish)

'remarkable race perhaps dashes in the middle boat' is the wordplay.
I cannot really understand how this works, but
'remarkable' could be 'great' (I've seen this in another clue) and 'great' is found in the answer.
'race' could be 'white' (White race is an example) and 'white' is located in the answer.
'boat' could be 'ark' (ark is a kind of boat) and 'ark' is found within the answer.
The remaining letters 'sh' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'and' is the link.

Can you help me to learn more?