Went over log to study part describing fascinating proportion (6,7)

I believe the answer is:

golden section

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

'fascinating proportion' is the definition.
'golden section' can be an answer for 'proportion' (golden section is a kind of proportion). I'm unsure of the 'fascinating' bit.

'went over log to study part' is the wordplay.
'went over' is a reversal indicator (I've seen 'going over' mean this).
'to study' becomes 'den' (term for a study or office).
'part' becomes 'section' (synonyms).
'log' backwards is 'gol'.
'gol'+'den'+'section'='GOLDEN SECTION'

'describing' is the link.

Can you help me to learn more?

(Other definitions for golden section that I've seen before include "satisfying proportion" , "pleasing visual proportion" .)

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.