Same pushy order for a side dish (5,4)
I believe the answer is:
mushy peas
'side dish' is the definition.
(I know that mushy peas is a type of side dish)
'same pushy order' is the wordplay.
'order' indicates anagramming the letters.
'same'+'pushy'='samepushy'
'samepushy' with letters rearranged gives 'MUSHY PEAS'.
'for a' is the link.
(Other definitions for mushy peas that I've seen before include "Pulpy green food" , "Squidgy green side dish served in a greasy spoon cafe" , "Squishy green food" , "Squashed green foodstuff" , "Vegetable to go with fish and chips?" .)