Clamour about the ship’s red colour (6)
I believe the answer is:
cherry
'red colour' is the definition.
(shade of red)
'clamour about the ship's' is the wordplay.
'clamour' becomes 'cry' (clamour can mean to cry or yell).
'about' means one lot of letters goes inside another.
'the ship's' becomes 'her' (a ship can be referred to by 'she' and 'her').
'cry' enclosing 'her' is 'CHERRY'.
(Other definitions for cherry that I've seen before include "Virginity (slang)" , "Tree with stoned fruit" , "What fruiterer may have" , "Red liqueur" , "Stone fruit - shade of red" .)