Paul's daughter almost outstanding (6)
I believe the answer is:
stella
'paul's daughter' is the definition.
The definition suggests a singular noun which matches the answer.
'almost outstanding' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'outstanding' becomes 'stellac' (I've seen this in another clue).
'stellac' with its final letter removed is 'STELLA'.
Can you help me to learn more?
(Other definitions for stella that I've seen before include "Paul McCartney's daughter" , "____ McCartney, fashion designer" , "Swift alias for Esther" , "Swift favourite" , "girl!" .)