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

The straight part
We know that "Instruments" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instruments = guitars.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 GUITARS mean?
GUITARS noun- A stringed musical instrument, of European origin, usually with a fretted fingerboard and six strings, played with the fingers or a plectrum (guitar pick).
- Any type of musical instrument of the lute family, characterized by a flat back, along with a neck whose upper surface is in the same plane as the soundboard, with strings along the neck and parallel to the soundboard.
- To play the guitar.