Seek to be careful (4,3)
I believe the answer is:
look out
'be careful' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for look out that I've seen before include "makes one be careful!" , "A view of the future" , "as Wenceslas did" , "Be watchful" , "Take care" .)