Point to a chap called Jack (6)

I believe the answer is:

seaman

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'called jack' is the definition.
'seaman' can be an answer for 'jack' (I've seen this in another clue). I'm unsure of the 'called' bit.

'point to a chap' is the wordplay.
'point' becomes 'sea' (I can't explain this - if you can you should believe this answer much more).
'to a chap' becomes 'man' (chap can mean a man).
'sea'+'man'='SEAMAN'

Can you help me to learn more?

(Other definitions for seaman that I've seen before include "crew member" , "A manse (anag.)" , "Sailor" , "Mariner" .)

I've seen this clue in the Evening Standard.

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