Cryptic crossword clue
Tear up receipt so foolishly – it’s good to retain 3,2,6

The most common and most likely answer to this crossword clue is the 3 plus 2 plus 6 letter word RIP TO PIECES

I've seen this crossword clue in The Guardian
R
I
P
T
O
P
I
E
C
E
S

Buddy explains!

The straight part
We know that "Tear up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tear up = rip to pieces.
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.

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