A looser arrangement for distributing under pressure (7)
I believe the answer is:
aerosol
'distributing under pressure' is the definition.
I can't judge whether this definition defines the answer.
'a looser arrangement' is the wordplay.
'arrangement' is an anagram indicator.
'looser' with letters rearranged gives 'erosol'.
'a'+'erosol'='AEROSOL'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for aerosol that I've seen before include "What makes mist" , "fog?" , "can, probably" , "Atomiser" , "Pressurised canister that emits spray of fine droplets" .)