Eagerness shown for oversize almonds (4)

I believe the answer is:

zeal

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

'eagerness' is the definition.
(I know that zeal is a type of eagerness)

'for oversize almonds' is the wordplay.
'ZEAL' is hidden within the letters.
However, I am unsure how this is indicated.

'shown' is the link.

Can you help me to learn more?

(Other definitions for zeal that I've seen before include "Zest, ardour" , "Dedicated enthusiasm" , "Fanaticism" , "(Excessive) fervour" , "Fervent devotion" .)

I've seen this clue in The Irish Times.

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