Is put off by the figure, which is silly (6)
I believe the answer is:
stupid
'is silly' is the definition.
(I've seen this before)
'is put off by the figure' is the wordplay.
'off' indicates an anagram.
'by' means one lot of letters go next to another.
'the figure' becomes 'd' (I've seen this in other clues).
'is'+'put'='isput'
'isput' anagrammed gives 'stupi'.
'stupi'+'d'='STUPID'
'which' is the link.
(Other definitions for stupid that I've seen before include "Lacking in common sense" , "Idiot" , "Idiotic" , "moronic" , "Irresponsible" .)