A huge shipping order? (5)
I believe the answer is:
avast
'shipping order?' is the definition.
The definition and answer are not the same part of speech.
'a huge' is the wordplay.
'huge' becomes 'vast' (I've seen this before).
'a'+'vast'='AVAST'
Can you help me to learn more?
(Other definitions for avast that I've seen before include "Stop (nautical)" , ""stop" signal" , "Stop on board" , "shout stopping the ship" , "Stop, nautically speaking" .)