The most common and most likely answer to this crossword clue is the 7 letter word PUZZLER
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More clues leading to the result PUZZLER
Buddy explains!

The straight part
We know that "Problem" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case problem = puzzler.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 PUZZLER mean?
PUZZLER noun- A puzzling situation or problem; an enigma.
- A video game in which the player is presented with (usually abstract) puzzles to solve.
- One who solves puzzles as a hobby.