The most common and most likely answer to this crossword clue is the 7 letter word FLUTTER
I've seen this crossword clue in The Guardian
F
L
U
T
T
E
R
More clues leading to the result FLUTTER
- Bet pound on leading filly, say
- Maker of an instrument gripping end of cricket bat
- Bat following turtle all over the place
- Bet a butterfly can do it
- Bet or beat fast
- Bat, making fine half-century, say
- State of agitation in which female’s left, say
- Female, 50, say, makes a modest bet
- Following mess, Conservative leader quits leading to speculation
Buddy explains!

The straight part
We know that "Bat" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bat = flutter.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 FLUTTER mean?
FLUTTER noun- The act of fluttering; quick and irregular motion.
- A state of agitation.
- An abnormal rapid pulsation of the heart.
- A small bet or risky investment.
- A hasty game of cards or similar.
- (audio) The rapid variation of signal parameters, such as amplitude, phase, and frequency.
- To flap or wave quickly but irregularly.
- Of a winged animal: to flap the wings without flying; to fly with a light flapping of the wings.
- To cause something to flap.
- To drive into disorder; to throw into confusion.
- To be in a state of agitation or uncertainty.
- To be frivolous.