It encloses a little open space (6)

I believe the answer is:

eyelet

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'it encloses a little open space' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for eyelet that I've seen before include "Small hole for lacing" , "peephole" , "Small ring, for shoelace perhaps" , "Hole in shoe through which lace passes" , "Small hole for lace, etc" .)

I've seen this clue in the Evening Standard.

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