Crossword Genius

Fitness of this cheeky drinking toast? (4,6)

Ross

I believe the answer is:

rude health

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'fitness of' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'cheeky drinking toast?' is the wordplay.
'cheeky drinking' becomes 'rude' (I am not sure about this - if you are sure you should believe this answer much more).
'toast?' becomes 'health' (I've seen this before).
'rude'+'health'='RUDE HEALTH'

'this' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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