Little hole a viewer is allowed to use? (6)
I believe the answer is:
eyelet
'little hole a viewer' is the definition.
I can't tell whether this defines the answer.
'allowed to use?' is the wordplay.
'allowed' becomes 'let' (I've seen this before).
'to' says to put letters next to each other (I've seen this in other clues).
'use?' becomes 'eye' (I can't justify this - if you can you should believe this answer much more).
'let' put after 'eye' is 'EYELET'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for eyelet that I've seen before include "Shoe hole for lacing" , "One caught by hook" , "hole in shoe leather?" , "Means of securing" , "Small ring, for shoelace perhaps" .)