Fabled sinner hiding diamonds beneath a skirt (5)
I believe the answer is:
evade
'skirt' is the definition.
(synonyms)
'fabled sinner hiding diamonds beneath a' is the wordplay.
'fabled sinner' becomes 'eve' (Biblical figure. I am not sure about the 'fabled' bit.).
'hiding' indicates putting letters inside.
'diamonds' becomes 'd' (abbreviation for the card suit diamonds).
'beneath' is a charade indicator (letters next to each other) (in a down clue).
'd' put after 'a' is 'ad'.
'eve' enclosing 'ad' is 'EVADE'.
Can you help me to learn more?
(Other definitions for evade that I've seen before include "Shun, escape" , "Dodge or escape" , "To get away from" , "Escape (esp. by guile)" , "Fail to pay" .)