Upstart in disorderly gaggle with suitcases (7)
I believe the answer is:
luggage
'suitcases' is the definition.
(I've seen this before)
'upstart in disorderly gaggle' is the wordplay.
'upstart' becomes 'u' (start of the word 'up').
'in' means one lot of letters goes inside another.
'disorderly' is an anagram indicator.
'gaggle' with letters rearranged gives 'lggage'.
'u' inserted into 'lggage' is 'LUGGAGE'.
'with' is the link.
(Other definitions for luggage that I've seen before include "(Traveller's) suitcases" , "Travel bags" , "Suitcases and travelling bags" , "Traps" , "Traveller's bags etc" .)