The most common and most likely answer to this crossword clue is the 13 letter word PROBLEMATICAL
I've seen this crossword clue in The Times
P
R
O
B
L
E
M
A
T
I
C
A
L
Buddy explains!
The straight part
We know that "terrible puzzle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case terrible puzzle = problematical.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 PROBLEMATICAL mean?
PROBLEMATICAL adjective- Doubtful or disputed
- Dubious or ambiguous