Just for show (4)
I believe this is a double definition.
'just' is the first definition.
(just can mean fair in the sense of showing justice)
'for show' is the second definition.
(fair is a kind of show)
(Other definitions for fair that I've seen before include "entertainment provided here" , "Reasonable target?" , "clean" , "Just right" , "Just; beautiful; blond" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">just for show</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ornamental that I've seen before include "Plant grown for attractive appearance" , "Decorative" , "non-functional" , "showy" , "Fancy" .)