Inscrutable sorts (7)
I believe the answer is:
enigmas
'inscrutable sorts' is the definition.
(I know that enigma are cryptic)
This is the entire clue.
(Other definitions for enigmas that I've seen before include "Puzzles - mysteries" , "Problems" , "'Mysteries, riddles (7)'" , "They're mysterious or difficult to understand" , "'Puzzles, riddles (7)'" .)