Important part of course giving entry to Yale? (7)

I believe the answer is:

keyhole

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'course giving entry to yale?' is the definition.
I can't tell whether this defines the answer.

'important part' is the wordplay.
'important' becomes 'key' (similar in meaning).
'part' becomes 'hole' (hole is a kind of part).
'key'+'hole'='KEYHOLE'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for keyhole that I've seen before include "Lock entry" , "Aperture in lock - kind of surgery" , "may cover a number of wards" , "Type of surgery" , "Opening for the opener" .)

I've seen this clue in The Independent.

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