1956 Peck role (4)
I believe the answer is:
'1956 peck role' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ahab that I've seen before include "Captain in search of Moby Dick" , "Husband of Jezebel" , "Captain -, pursuer of Moby Dick" , "one who hunted whales" , "Jezebel's husband or captain in 'Moby Dick'" .)