Inclined to brag, boy missing at the end dreadful faults (8)
I believe the answer is:
boastful
'inclined to brag' is the definition.
(I know that boastful can mean tending to blow)
'boy missing at the end dreadful faults' is the wordplay.
'missing at the end' means to remove the last letter.
'dreadful' is an anagram indicator.
'boy' with its last letter taken away is 'bo'.
'faults' with letters rearranged gives 'astful'.
'bo'+'astful'='BOASTFUL'
(Other definitions for boastful that I've seen before include "Talking with excessive pride in oneself" , "Talking with much pride" , "Given to blowing one's own trumpet" , "Cocky" , "Vainglorious" .)