Unstable Argo ships gallons in hostilities (5)
I believe the answer is:
aggro
'unstable argo ships gallons in hostilities' is the definition.
I can't judge whether this defines the answer.
'unstable argo ships gallons' is the wordplay.
'unstable' is an anagram indicator.
'ships' is an insertion indicator (to ship can mean to carry or transport something).
'gallons' becomes 'g' (abbreviation).
'argo' with letters rearranged gives 'agro'.
'agro' going around 'g' is 'AGGRO'.
Can you help me to learn more?
(Other definitions for aggro that I've seen before include "Grief" , "belligerent troublemaking" , "offensive behaviour" , "Problems and difficulties" , "Difficulties, trouble" .)