The most common and most likely answer to this crossword clue is the 13 letter word GRANDILOQUENT
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Buddy explains!
The straight part
We know that "Bombastic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bombastic = grandiloquent.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does GRANDILOQUENT mean?
GRANDILOQUENT adjective- (of a person, their language or writing) given to using language in a showy way by using an excessive amount of difficult words to impress others; bombastic; turgid