Questions in hearing after multinational group's badly advised (6)
I believe the answer is:
unwise
'badly advised' is the definition.
'questions in hearing after multinational group's' is the wordplay.
'questions' becomes 'whys'.
'in hearing' indicates a 'sounds like' (homophone) clue.
'after' means one lot of letters go next to another.
'multinational group' becomes 'un' (United Nations).
'whys' sounds like 'wise'.
'wise' after 'un' is 'UNWISE'.
(Other definitions for unwise that I've seen before include "Not sensible, foolish" , "isn't sensible" , "Ill-judged" , "Foolhardy" , "Not sensible or prudent" .)