Crossword Genius

But catching one is no credit to a sailor! (4)

Ross

I believe the answer is:

crab

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

'but catching one is no' is the definition.
I can't tell whether this definition defines the answer.

'credit to a sailor' is the wordplay.
'credit' becomes 'cr'.
'to a sailor' becomes 'ab' (abbreviation for able seaman).
'cr'+'ab'='CRAB'

Can you help me to learn more?

(Other definitions for crab that I've seen before include "Seafood (that can be caught by a rower?)" , "Clawed shellfish" , "A crustacean; type of apple" , "Food from the sea" , "Ten-legged shellfish" .)

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