Unusually solid images (5)
I believe the answer is:
idols
'images' is the definition.
(I know this)
'unusually solid' is the wordplay.
'unusually' indicates anagramming the letters.
'solid' is an anagram of 'IDOLS'.
(Other definitions for idols that I've seen before include "Objects of worship" , "Heroes" , "Graven images sometimes worshipped" , "Solid (anag.)" , "Much-admired persons" .)