Weekends ultimately fine for hosting Flipper (6)

I believe the answer is:

fokker

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'flipper' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'weekends ultimately fine for hosting' is the wordplay.
'weekends' becomes 'kk' (I can't explain this - if you can you should give a lot more credence to this answer).
'ultimately' suggests the final letters.
'hosting' indicates putting letters inside.
The final letter of 'fine' is 'e'.
'kk'+'e'='kke'
'kke' going into 'for' is 'FOKKER'.

Can you help me to learn more?

(Another definition for fokker that I've seen is " old fighter".)

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

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