Final letter from duck sitting on mammoth (5)

I believe the answer is:

omega

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'final letter' is the definition.
(last letter of the Greek alphabet)

'duck sitting on mammoth' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'sitting on mammoth' becomes 'mega' (I can't justify this - if you can you should believe this answer much more).
'o'+'mega'='OMEGA'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for omega that I've seen before include "Final outcome" , "symbol of resistance?" , "Last (Gk. letter)" , "Greek finalist" , "Final Greek letter" .)

I've seen this clue in The Independent.

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