Puzzles solved in games (7)
I believe the answer is:
enigmas
'puzzles' is the definition.
(an enigma is a puzzle or mystery)
'solved in games' is the wordplay.
'solved' is an anagram indicator (the anagram must be solved).
'in'+'games'='ingames'
'ingames' anagrammed gives 'ENIGMAS'.
(Other definitions for enigmas that I've seen before include "They're mysterious or difficult to understand" , "'Puzzles, riddles (7)'" , "'Mysteries, riddles (7)'" , "Problems" , "Puzzles - mysteries" .)