Point of order? That could be unpolitic (9)
I believe the answer is:
Here is my best explanation:
'point of order?' is the definition.
(a punctilio is a petty or minor point)
'could be unpolitic' is the wordplay.
'could be' indicates anagramming the letters.
'unpolitic' with letters rearranged gives 'PUNCTILIO'.
'that' acts as a link.