Somewhat indecent and arrogant to change starter (7)
I believe the answer is:
naughty
'somewhat indecent' is the definition.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for naughty that I've seen before include "mildly indecent" , "Badly behaved, mischievous" , "Risqu" , "Wicked" , "Dubious" .)