Crossword Genius

Could you credit a sailor catching one? (4)

Ross

I believe the answer is:

crab

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'could you' is the definition.
I can't tell whether this defines the answer.

'credit a sailor catching one?' is the wordplay.
'credit' becomes 'cr'.
'a sailor' becomes 'b' (I can't explain this - if you can you should give a lot more credence to this answer).
'catching' indicates putting letters inside.
'one?' becomes 'a'.
'cr'+'b'='crb'
'crb' placed around 'a' is 'CRAB'.

Can you help me to learn more?

(Other definitions for crab that I've seen before include "Shellfish with pincers" , "one is a fiddler" , "Seashore creature" , "Crustacean with pincers - grumble" , "Decapod crustacean" .)

I've seen this clue in the Evening Standard.
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