Turmoil as postal system reported awful storm (9)
I believe the answer is:
maelstrom
'turmoil' is the definition.
(I've seen this before)
'postal system reported awful storm' is the wordplay.
I cannot really see how this works, but
an anagram of 'storm' is 'strom' which is present in the answer.
This explanation may well be incorrect...
'as' acts as a link.
Can you help me to learn more?
(Other definitions for maelstrom that I've seen before include "extreme turbulence" , "Large whirlpool" , "fearsome current" , "Powerful whirlpool" , "Powerful circular current of water" .)