Crossword Genius

What has a large existence primarily? (5)

Ross

I believe the answer is:

whale

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'what has a large existence primarily?' is the definition.
I know that 'large' relates to this answer.

'has a large existence primarily?' is the wordplay.
'has' becomes 'wha' (I can't justify this - if you can you should believe this answer much more).
'primarily?' indicates taking the first letters (I've seen 'primarily' mean this).
The initial letters of 'large existence' is 'le'.
'wha'+'le'='WHALE'

Can you help me to learn more?

(Other definitions for whale that I've seen before include "Leviathan" , "One wallowing in the drink" , "Great sea mammal" , "Huge mammal" , "Large cetacean" .)

I've seen this clue in The Sun.
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