The most common and most likely answer to this crossword clue is the 7 letter word INJECTS
I've seen this crossword clue in The Daily Telegraph
I
N
J
E
C
T
S
Buddy explains!

The straight part
We know that "Introduces" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case introduces = injects.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 INJECTS mean?
INJECTS verb- To push or pump (something, especially fluids) into a cavity or passage.
- To introduce (something) suddenly or violently.
- To administer an injection to (someone or something), especially of medicine or drugs.
- To take or be administered something by means of injection, especially medicine or drugs.
- To introduce (code) into an existing program or its memory space, often without tight integration and sometimes through a security vulnerability.
- To cast or throw; used with on.