An opening I need no help in making (7)
I believe the answer is:
pinhole
'an opening' is the definition.
(I know that pinhole is a type of opening)
'no help in making' is the wordplay.
'no' becomes 'O' (resembles 0 - 'no' can mean 'zero').
'making' is an anagram indicator.
'o'+'help'+'in'='ohelpin'
'ohelpin' anagrammed gives 'PINHOLE'.
'i need' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pinhole that I've seen before include "This may let in a chink of light" , "Small puncture" , "little gap" , "Tiny aperture" .)