It's somewhat circular, like a ring in the nose (5)
I believe the answer is:
noose
'it's somewhat circular' is the definition.
I can't tell whether this definition defines the answer.
'a ring in the nose' is the wordplay.
'a ring' becomes 'o' (letter resembling a ring).
'in' is an insertion indicator.
'o' going inside 'nose' is 'NOOSE'.
'like' is the link.
Can you help me to learn more?
(Other definitions for noose that I've seen before include "Hangman's knot" , "Looped rope" , "Hangman's rope" , "Loop - snare" , "Cord snare" .)