Opening for an upper member (7)
I believe the answer is:
armhole
'opening for an upper member' is the definition.
I can't judge whether this definition defines the answer.
'opening for an upper member' is the wordplay.
'opening' becomes 'hole' (hole is a kind of opening).
'for' says to put letters next to each other (I've seen this in other clues).
'an upper member' becomes 'arm' (member can mean a limb. I am not sure about the 'upper' bit.).
'hole' after 'arm' is 'ARMHOLE'.
Can you help me to learn more?
(Other definitions for armhole that I've seen before include "Space" , "Jacket opening" , "part of jacket" , "Feature of coat" , "Garment opening" .)