Crossword Genius

Time to break up corrupted UN? Idi Amin has imprisoned the French leader permanently (2,9)

Ross

I believe the answer is:

ad infinitum

I'm a little stuck... Click here to teach me more about this clue!

'permanently' is the definition.
(thesaurus)

'time to break up corrupted un? idi amin has imprisoned the french leader' is the wordplay.
I cannot quite understand how this works, but
'time' could be 'ad' and 'ad' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'french' could be 'f' and 'f' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ad infinitum that I've seen before include "Endlessly, forever (Lat.)" , "Indefinitely" .)

I've seen this clue in The Hindu.
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