The most common and most likely answer to this crossword clue is the 4 letter word SOON
S
O
O
N
More clues leading to the result SOON
- Thus working shortly
- Not one sailor returned quickly
- Odd characters from show performing shortly
- Boy embraces love willingly
- Sage will lose his heart readily
- Member of family admits love willingly
- With little delay, then working
- Oslo town regularly getting washed out in the near future
- Child jumps over hole in no time
Buddy explains!

The straight part
We know that "readily" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case readily = soon.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 SOON mean?
SOON adjective- Short in length of time from the present.
- Early
- Immediately, instantly.
- Within a short time; quickly.
- Early.
- Readily; willingly; used with would, or some other word expressing will.