Section of text appearing right inside bar (7)

I believe the answer is:

excerpt

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'section of text' is the definition.
'excerpt' can be an answer for 'section' (excerpt is a kind of section). I am unsure of the 'of text' bit.

'appearing right inside bar' is the wordplay.
'appearing right' becomes 'r' (common abbreviation. I am not sure about the 'appearing' bit.).
'inside' means one lot of letters goes inside another.
'bar' becomes 'except' (both can mean 'not including').
'r' put into 'except' is 'EXCERPT'.

Can you help me to learn more?

(Other definitions for excerpt that I've seen before include "Cutting" , "Literary taste" , "Passage cut" , "Short passage" , "Quote" .)

I've seen this clue in The Guardian.

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