Crossword Genius

Flat object used in surfing (3)

Ross

I believe the answer is:

fin

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'surfing' is the definition.
(thesaurus)

'flat object' is the wordplay.
'flat' becomes 'fi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'object' becomes 'n' (N is an example).
'fi'+'n'='FIN'

'used in' is the link.

Can you help me to learn more?

(Other definitions for fin that I've seen before include "Part of an aircraft's tail" , "Fish propeller; end (Fr.)" , "Piscine appendage" , "For movement and balance in fish" , "Fishy appendage" .)

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