I'd party with abandon in short excursion (3,4)
I believe the answer is:
day trip
'short excursion' is the definition.
(I've seen this in another clue)
'i'd party with abandon' is the wordplay.
'with abandon' indicates anagramming the letters.
'id'+'party'='idparty'
'idparty' is an anagram of 'DAY TRIP'.
'in' acts as a link.
(Other definitions for day trip that I've seen before include "Brief excursion" , "Excursion within 24 hours" , "Outing" , "Pay dirt (anag.)" .)