The most common and most likely answer to this crossword clue is the 7 letter word MONKEYS
I've seen this crossword clue in The Guardian
M
O
N
K
E
Y
S
Buddy explains!
The straight part
We know that "Fiddles" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fiddles = monkeys.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 MONKEYS mean?
MONKEYS noun- Any member of the clade Simiiformes not also of the clade Hominoidea containing humans and apes, from which they are usually, but not universally, distinguished by smaller size, a tail, and cheek pouches.
- Any nonhuman simian primate, including apes.
- A mischievous child.
- A dance move popular in the 1960s.
- Five hundred pounds sterling; five hundred dollars.
- A person or the role of the person on the sidecar platform of a motorcycle involved in sidecar racing.
- A person with minimal intelligence and/or an unattractive appearance
- A face card.
- A menial employee who does a repetitive job, as in code monkey, grease monkey, phone monkey, powder monkey.
- The weight or hammer of a pile driver; a heavy mass of iron, which, being raised high, falls on the head of the pile, and drives it into the earth; the falling weight of a drop hammer used in forging.
- A small trading vessel of the sixteenth century.
- A drug habit; an addiction; a compulsion.
- A fluid consisting of hydrochloric acid and zinc, used in the process of soldering.
- A person's temper, said to be "up" when they are angry.
- A black person.
- To meddle; to mess (with).
- To mimic; to ape.