Perfect small-scale version (5)
I believe the answer is:
model
I believe this clue is a double definition.
'perfect' is the first definition.
(thesaurus)
'small-scale version' is the second definition.
(I've seen this before)
(Other definitions for model that I've seen before include "Fashion - prototype" , "Poser for painter or photographer" , "Example (on the catwalk?)" , "Small-size version" , "She walks the catwalk" .)