The most common and most likely answer to this crossword clue is the 6 letter word AMBLED
I've seen this crossword clue in The Times
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More clues leading to the result AMBLED
- Proceeded casually — risked losing the lead
- Took constitutional risk, heading off Democrat
- Australian doctor was first, having walked slowly
- A maiden showed signs of injury and proceeded slowly
- Walked slowly, heading away from bet
- Walked before noon, then ran
- What leisurely walker did — risked going topless
Buddy explains!

The straight part
We know that "Proceeded casually" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case proceeded casually = ambled.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 AMBLED mean?
AMBLED verb- To stroll or walk slowly and leisurely.
- Of a quadruped: to move along by using both legs on one side, and then the other.