The most common and most likely answer to this crossword clue is the 4 letter word INTO
I've seen this crossword clue in The Times
I
N
T
O
More clues leading to the result INTO
- Concerned with uneven features of ignition?
- Obsessed with gin, toff drinks
- Knowledgeable about fashionable tops? Not half!
- Knowledgeable about Shintoism? Not entirely
- Keen on India article being dumped by international body
- A fan of eastern religion wanting silence
- Liking one, and possibly not
- Potty for one not old
- Enthusiastic about pub also, we hear
- A fan of Not Going Out after third episode
Buddy explains!

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 INTO mean?
INTO preposition- To or towards the inside of.
- To or towards the region of.
- Against, especially with force or violence.
- Indicates transition into another form or substance.
- After the start of.
- Interested in or attracted to.
- Expressing the operation of multiplication.
- Expressing the operation of division, with the denominator given first. Usually with "goes".
- Investigating the subject (of).