Crossword Genius

Day off - very good, that is (6)

Ross

I believe the answer is:

sickie

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'day off' is the definition.

'good that is' is the wordplay.
'good' becomes 'sick' (I can't justify this - if you can you should believe this answer much more).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'sick'+'ie'='SICKIE'

'very' acts as a link.

Can you help me to learn more?

(Other definitions for sickie that I've seen before include "ill-deserved leave?" , "Day off for malingerer" , "Leave taken with feigned illness" , "In day off work" .)

I've seen this clue in The Daily Express.
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