Crossword Genius

Take out sister filled with love, kindness or faith? (8,4)

Ross

I believe the answer is:

abstract noun

I'm a little stuck... Click here to teach me more about this clue!

'kindness or faith?' is the definition.
I can't tell whether this definition defines the answer.

'take out sister filled with love' is the wordplay.
'take out' becomes 'abstract' (abstracting is a kind of taking. I am not sure about the 'out' bit.).
'sister' becomes 'nun' (nuns are referred to as sister).
'filled with' is an insertion indicator.
'love' becomes 'o' (love means zero in tennis).
'nun' placed around 'o' is 'noun'.
'abstract'+'noun'='ABSTRACT NOUN'

Can you help me to learn more?

(Other definitions for abstract noun that I've seen before include "Substantive referring to non-physical thing" , "carelessness perhaps" .)

I've seen this clue in The Telegraph.
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