Crossword Genius

It becomes a different instrument by adding "f" to the front (4)

Ross

I believe the answer is:

lute

(Other definitions for lute that I've seen before include "Old stringed instrument with a pear-shaped body" , "Subject to drugs" , "Old guitar-like instrument played by minstrels" , "Old musical instrument" , "Plucked instrument; a sealant" .)

I've seen this clue in the USA Today.
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