The most common and most likely answer to this crossword clue is the 9 letter word PRESENTED
I've seen this crossword clue in Financial Times
P
R
E
S
E
N
T
E
D
Buddy explains!
The straight part
We know that "Introduced" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case introduced = presented.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 PRESENTED mean?
PRESENTED verb- To bring (someone) into the presence of (a person); to introduce formally.
- To nominate (a member of the clergy) for an ecclesiastical benefice; to offer to the bishop or ordinary as a candidate for institution.
- To offer (a problem, complaint) to a court or other authority for consideration.
- To charge (a person) with a crime or accusation; to bring before court.
- To come forward, appear in a particular place or before a particular person, especially formally.
- To put (something) forward in order for it to be seen; to show, exhibit.
- To make clear to one's mind or intelligence; to put forward for consideration.
- To put on, stage (a play etc.).
- To point (a firearm) at something, to hold (a weapon) in a position ready to fire.
- To offer oneself for mental consideration; to occur to the mind.
- To come to the attention of medical staff, especially with a specific symptom.
- To appear (in a specific way) for delivery (of a fetus); to appear first at the mouth of the uterus during childbirth.
- (with "as") To appear or represent oneself (as having a certain gender).
- To act as presenter on (a radio, television programme etc.).
- To give a gift or presentation to (someone).
- To give (a gift or presentation) to someone; to bestow.
- To deliver (something abstract) as though as a gift; to offer.
- To hand over (a bill etc.) to be paid.
- To display one's female genitalia in a way that signals to others that one is ready for copulation. Also referred to as lordosis behaviour.
- (of a group) Having a specified presentation, or a presentation with specified properties.