Could it be stormy Lewis wife departs? (4)
I believe the answer is:
isle
'could it' is the definition.
I can't judge whether this definition defines the answer.
'stormy lewis wife departs?' is the wordplay.
'stormy' indicates anagramming the letters.
'wife' becomes 'w'.
'departs?' suggests deleting specific letters.
'lewis' with 'w' taken away is 'leis'.
'leis' anagrammed gives 'ISLE'.
'be' is the link.
Can you help me to learn more?
(Other definitions for isle that I've seen before include "One surrounded by water" , "Man, maybe" , "Ait" , "Sea-girt land" , "one has water all round" .)