Sparkle misplaced in Tallis etc (11)
I believe the answer is:
scintillate
'sparkle' is the definition.
(to scintillate is to sparkle or gleam)
'misplaced in tallis etc' is the wordplay.
'misplaced' is an anagram indicator (letters in the wrong places).
'in'+'tallis'+'etc'='intallisetc'
'intallisetc' with letters rearranged gives 'SCINTILLATE'.
(Other definitions for scintillate that I've seen before include "Twinkle - sparkle" , "Coruscate" , "give sparkling performance" , "Flash, sparkle" , "Emit flashes of light" .)