Boys carrying tipsy mum's order (7)
I believe the answer is:
summons
'order' is the definition.
(I know that summons is a type of order)
'boys carrying tipsy mum's' is the wordplay.
'boys' becomes 'sons' ('son' can be a synonym of 'boy').
'carrying' is an insertion indicator.
'tipsy' indicates anagramming the letters.
'mum' anagrammed gives 'umm'.
'sons' enclosing 'umm' is 'SUMMONS'.
(Other definitions for summons that I've seen before include "orders" , "Legal order" , "Subpoena" , "Order to appear in law court" , "Call (to court)" .)