Enigma (7)
'enigma' is the definition.
(I know that enigma can be written as riddle)
This is all the clue.
(Other definitions for riddle that I've seen before include "Ingenious question" , "Word puzzle or coarse sieve" , "Strain" , "Brain-teaser and coarse sieve" , "The large sieve is a puzzle" .)
'enigma' is the definition.
(I know that enigma can be written as mystery)
This is the entire clue.
(Other definitions for mystery that I've seen before include "Secret doctrine" , "associated with Macavity" , "It can't be explained" , "Something strange and inexplicable" , "Something difficult to understand" .)
'enigma' is the definition.
(I know that enigma can be written as conundrum)
This is the entire clue.
(Other definitions for conundrum that I've seen before include "Poser" , "Difficult problem" , "Puzzle, riddle" , "Difficult question" , "Puzzling question" .)