All tire badly, to be exact (7)
I believe the answer is:
literal
'be exact' is the definition.
(similar in meaning)
'all tire badly' is the wordplay.
'badly' indicates an anagram (letters in the wrong order).
'all'+'tire'='alltire'
'alltire' anagrammed gives 'LITERAL'.
'to' acts as a link.
(Other definitions for literal that I've seen before include "Textual error" , "Verbatim - true" , "Lacking imagination; misprint" , "A tiller (anag.)" , "Actual" .)