Crossword Genius

That is going to time, visiting sick (4)

Ross

I believe the answer is:

itll

'that is going to' is the definition.
('it will do it' means 'that is going to do it')

'time visiting sick' is the wordplay.
'time' becomes 't' (abbreviation).
'visiting' means one lot of letters goes inside another.
'sick' becomes 'ill' (synonyms).
't' going inside 'ill' is 'ITLL'.

I've seen this clue in The Guardian.
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