Everyman's on the up, succeeded, getting ahead? Not entirely accurate (10)
I believe the answer is:
misleading
'ahead? not entirely accurate' is the definition.
I can't tell whether this definition defines the answer.
'everyman's on the up succeeded getting' is the wordplay.
'everyman's' becomes 'I'm' (where the crossword setter is 'Everyman').
'on the up' says the letters should be written backwards (in a down clue, letters go up).
'succeeded' becomes 's' (genealogical abbreviation).
'getting' becomes 'leading' (leading is a kind of getting).
'im' reversed gives 'mi'.
'mi'+'s'+'leading'='MISLEADING'
Can you help me to learn more?
(Other definitions for misleading that I've seen before include "Deceptive" , "Giving a false impression" , "Giving a wrong impression" , "Unreliable" , "pointing in the wrong direction" .)