Watch cruise ship that's used to bring out pupils?
I believe the answer is:
eyeliner
'used to bring out pupils?' is the definition.
I can't tell whether this definition defines the answer.
'watch cruise ship' is the wordplay.
'watch' becomes 'eye' (I've seen this before).
'cruise ship' becomes 'liner' (I've seen this before).
'eye'+'liner'='EYELINER'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for eyeliner that I've seen before include "Item of 25dn" , "Makeup for the peepers" , "Facial cosmetic" , "kind of cosmetic" , "highlight for look-out" .)