I see Jack is one with Jezebel for a partner (4)
I believe the answer is:
ahab
'one with jezebel for a partner' is the definition.
I can't judge whether this definition defines the answer.
'i see jack' is the wordplay.
'i see' becomes 'ah' (exclamation used to indicate understanding).
'jack' becomes 'ab' (both can mean a sailor).
'ah'+'ab'='AHAB'
'is' is the link.
Can you help me to learn more?
(Other definitions for ahab that I've seen before include "Jezebel's husband or captain in 'Moby Dick'" , "One whose nemesis was white" , "one who hunted whales" , "Whaling Captain" , "Captain of the whaler Pequod" .)