The most common and most likely answer to this crossword clue is the 7 letter word STINGER
I've seen this crossword clue in The Guardian
S
T
I
N
G
E
R
More clues leading to the result STINGER
- Something used for spiking cocktail
- Isn’t busy good queen bee?
- Nightingale possibly biting head of terrified wasp, say?
- … middle of chest right after rock star’s painful blow
- Runs from part-time correspondent, one who goads
- Small cat grabbing end of scorpion's venomous tail
- Member of the chorus swallows last of hot drink
Buddy explains!

The straight part
We know that "wasp, say" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wasp, say = stinger.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 STINGER mean?
STINGER noun- A pointed portion of an insect or arachnid used for attack.
- Anything that is used to sting, as a means of attack.
- Anything, such as an insult, that stings mentally or psychologically.
- A cocktail of brandy and crème de menthe.
- A portable bed of nails to puncture car tires, used by police and military forces.
- A minor neurological injury of the spine characterized by a shooting or stinging pain down one arm, followed by numbness and weakness.
- A station identifier on television or radio played between shows.
- A scene shown on films or television shows after the credits.
- A nonlethal grenade using rubber instead of shrapnel, more commonly called a sting grenade.
- A final note played at the end of a military march.
- (television and film) An extension cord.
- A stinging nettle.
- Chironex fleckeri, an extremely venomous Australian box jellyfish.