Taj Mahal spires (8)
I believe the answer is:
minarets
'taj mahal spires' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for minarets that I've seen before include "Towers attached to mosques" , "Slender towers on mosques" , "I smarten up the mosque towers" , "Mosque turrets" , "Slender towers with balconies" .)