Glib excuse for culling wild goat (4)

I believe the answer is:

ibex

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

'wild goat' is the definition.
(I know that ibex is a type of wild goat)

'glib excuse for culling' is the wordplay.
'IBEX' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ibex that I've seen before include "Wild goat with large recurved horns" , "Mountain-goat" , "Wind goat of North Africa" , "Mountain goat with long curved horns" , "Wild goat with double curved horns" .)

I've seen this clue in the Sydney Morning Herald.

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