Appear scintillating in new singlet (7)
I believe the answer is:
'appear scintillating in' is the definition.
'glisten' can be an answer for 'appear' (glistening is a kind of appearing). I am not certain of the 'scintillating in' bit.
'new singlet' is the wordplay.
'new' indicates anagramming the letters.
'singlet' with letters rearranged gives 'GLISTEN'.
Can you help me to learn more?
(Other definitions for glisten that I've seen before include "Reflect", "Let sing (anag) -- shine", "Shine or sparkle wetly", "Shine like something wet", "'Shine, as if wet (7)'".)