The most common and most likely answer to this crossword clue is the 15 letter word CRIMINALÂ RECORD
I've seen this crossword clue in The Guardian
C
R
I
M
I
N
A
L
Â
R
E
C
O
R
D
Buddy explains!
The straight part
We know that "often added to with conviction" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case often added to with conviction = criminal record.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.