The most common and most likely answer to this crossword clue is the 6 letter word FREELY
I've seen this crossword clue in The Times
F
R
E
E
L
Y
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The straight part
We know that "without limit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case without limit = freely.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 FREELY mean?
FREELY adjective- Free; frank.
- Generous; noble; excellent; beautiful; lovely.
- In a free manner.
- Without interference or restriction.
- Of one's own free will.