Sounding like sensible questions (4)
I believe the answer is:
whys
'questions' is the definition.
'sounding like sensible' is the wordplay.
'sounding like' shows a homophone (sound like).
'sensible' becomes 'wise' (I've seen this in another clue).
'wise' sounds like 'WHYS'.
(Other definitions for whys that I've seen before include "Reasons" , "explanations" , "Causes underlying an action or situation" , "They partner "wherefores"" .)