Forward part of shoe not without padding ... (8)
I believe the answer is:
insolent
'forward' is the definition.
(thesaurus)
'part of shoe not without padding' is the wordplay.
'part of shoe' becomes 'insole' ('insole' is part of 'shoe').
'without padding' says to hollow out the word (remove centre letters) (without the middle letters which pad out the word).
'not' with its centre removed is 'nt'.
'insole'+'nt'='INSOLENT'
(Other definitions for insolent that I've seen before include "Bold" , "Impertinent" , "Lippy" , "Impudent and disrespectful" , "Pert" .)