Concealed by Mount Erebus going all the way up to a nice cap (5)

I believe the answer is:

beret

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'cap' is the definition.
(beret is a kind of cap)

'concealed by mount erebus going all the way up to a nice' is the wordplay.
'BERET' is hidden backwards in amongst the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for beret that I've seen before include "French-style hat" , "Soft flat hat" , "Round flattish cap" , "cap in France?" , "Soft peak-less kind of cap" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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