It's inconceivable that international organisation knew about it (7-2)
I believe the answer is:
unheard-of
'it's inconceivable' is the definition.
(thesaurus)
'international organisation knew about it' is the wordplay.
I cannot really understand how this works, but
'international' could be 'un' (I've seen this in other clues) and 'un' is present in the answer.
'about' could be 'of' and 'of' is found within the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
The remaining letters 'hard' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'that' acts as a link.
Can you help me to learn more?
(Other definitions for unheard-of that I've seen before include "Not previously known or done - inaudible?" , "Fear hound being not previously known" , "Without precedent" , "Inconceivable" , "Previously unknown" .)