Clue's naughty about great man having a roving eye (9)
I believe the answer is:
lecherous
'having a roving eye' is the definition.
I can't tell whether this defines the answer.
'clue's naughty about great man' is the wordplay.
'naughty' indicates anagramming the letters.
'about' indicates putting letters inside.
'great man' becomes 'hero' (I have seen 'Courageous man' mean 'hero' so perhaps 'man' could also mean 'hero'. I am not sure about the 'great' bit.).
'clues' is an anagram of 'lecus'.
'lecus' placed around 'hero' is 'LECHEROUS'.
Can you help me to learn more?
(Another definition for lecherous that I've seen is " Lustful".)