A second-rate crew? The rudeness! (3,7)
I believe the answer is:
bad manners
'rudeness' is the definition.
(bad manners is a kind of rudeness)
'a second-rate crew?' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
'second' could be 's' (common abbreviation) and 's' is located in the answer.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Another definition for bad manners that I've seen is " breach of etiquette".)