A rugby match is not odd in a ship (6)
I believe the answer is:
sevens
'a rugby' is the definition.
(I know that sevens is a type of rugby)
'not odd in a ship' is the wordplay.
'not odd' becomes 'even' ('even' is the opposite to 'odd').
'in' indicates putting letters inside.
'a ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'even' inserted into 'ss' is 'SEVENS'.
'match is' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for sevens that I've seen before include "cards!" , "Numbers" , "rugby competition" , "77" , "Card game; form of rugby" .)