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

The straight part
We know that "Puzzle solver" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case puzzle solver = decoder.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 DECODER mean?
DECODER noun- A person who decodes secret messages
- A device that decodes a scrambled electronic signal e.g. of a satellite television signal