Get ready for attack (3,5)
I believe the answer is:
set about
'attack' is the definition.
(I've seen this before)
'get ready for' is the wordplay.
'get ready' becomes 'set' (synonyms).
'for' becomes 'about' (I can't explain this - if you can you should believe this answer much more).
'set'+'about'='SET ABOUT'
Can you help me to learn more?
(Other definitions for set about that I've seen before include "Start to do something with determination" , "Begin - attack" , "Get cracking" , "Embark upon" .)