Dishy? No, he may appear like a tomboy (9)
I believe the answer is:
hoydenish
'like a tomboy' is the definition.
(hoydenish can describe a tomboyish girl)
'dishy? no he may appear' is the wordplay.
'may appear' is an anagram indicator (how the letters might appear in a different order).
'dishy'+'no'+'he'='dishynohe'
'dishynohe' with letters rearranged gives 'HOYDENISH'.
(Other definitions for hoydenish that I've seen before include "Like high-spirited lass" , "Like a romp" .)