The most common and most likely answer to this crossword clue is the 7 letter word ROUNDER
I've seen this crossword clue in Independent
R
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More clues leading to the result ROUNDER
Buddy explains!

The straight part
We know that "Complete circuit/more ring-like" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case complete circuit/more ring-like = rounder.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 ROUNDER mean?
ROUNDER adjective- (physical) Shape.
- Complete, whole, not lacking.
- (of a number) Convenient for rounding other numbers to; for example, ending in a zero.
- Pronounced with the lips drawn together; rounded.
- Outspoken; plain and direct; unreserved; not mincing.
- Finished; polished; not defective or abrupt; said of authors or their writing style.
- Consistent; fair; just; applied to conduct.
- Large in magnitude.
- (authorship, of a fictional character) Well-written and well-characterized; complex and reminiscent of a real person.
- Vaulted.
- A Methodist preacher traveling a circuit, also referred to as a circuit rider.
- A railroad man who worked at a roundhouse, operating the turntable.
- A person who earns a living by playing cards
- A person who makes the rounds of bars, saloons, and similar establishments; figuratively, a debaucher or roué
- One who rounds; one who comes about frequently or regularly.
- A tool for making an edge or surface round.