Companion of the Niña and Santa Maria (5)
I believe the answer is:
pinta
'companion of the nina and santa maria' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pinta that I've seen before include "Columbus's ship - some milk!" , "early delivery?" , "drink" , "vessel for Columbus?" , "Bottle of milk" .)