The most common and most likely answer to this crossword clue is the 5 letter word BANJO
I've seen this crossword clue in Financial Times
B
A
N
J
O
More clues leading to the result BANJO
- Musical instrument prohibition by judge, old
- Waltzing Matilda composer's instrument
- Instrument little woman placed at end of bar
- One Billy Connolly might pick on at a gig?
- It's played bluegrass and new jazz, only at first
- Jack’s entering bar with old sort of guitar
- Joan Baez initially composed for a stringed instrument
- Five characters in Cuban joint strumming instrument
- Instrument used by urban joiner
- One picks this east of Durban and west of Johannesburg, to some extent
Buddy explains!

The straight part
We know that "strumming instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case strumming instrument = banjo.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 BANJO mean?
BANJO noun- A stringed musical instrument (chordophone), usually with a round body, a membrane-like soundboard and a fretted neck, played by plucking or strumming the strings.
- Any of various similar musical instruments, such as the Tuvan doshpuluur, with a membrane-like soundboard.
- An object shaped like a banjo, especially a frying pan or a shovel.
- (Dagenham) A cul-de-sac with a round end.
- To play a banjo.
- To beat, to knock down.
- To shell or attack (a target).