The main element of a pleasure cruise? (5)
I believe the answer is:
'the main' is the definition.
'element of a pleasure cruise?' is the wordplay.
I cannot quite understand how this works, but
'element' could be 'ce' (Ce is an example) and 'ce' is located in the answer.
'of' could be 'o' and 'o' is present in the answer.
'a' could be 'an' and 'an' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ocean that I've seen before include "One of the Seven Seas" , "Immense expanse or quantity" , "Large stretch of water" , "Large amount of water and" , "Large expanse of sea" .)