Nice try guys, at least you were up for having a go......
Relax..... here is your answer.....
Question: A clue given in a crossword puzzle was given thus:- " Acid" 6.3.0.Fifty (seven letters)...
Answer : VI (6) TRI(3) O(0) L(Fifty) .....Vitriol...Acid.
........... 6 3 0 Fifty
Cheer up..... you gave it your best shot!
My inferiority complex is not as good as yours.