Showed surprise when a good man began a new trade (7)
I believe the answer is:
started
'showed surprise' is the definition.
(I've seen this before)
'a good man began a new trade' is the wordplay.
'a good man' becomes 's'.
'began' becomes 't' (I can't explain this - if you can you should believe this answer much more).
'a new' indicates anagramming the letters.
'trade' with letters rearranged gives 'arted'.
's'+'t'+'arted'='STARTED'
'when' acts as a link.
Can you help me to learn more?
(Other definitions for started that I've seen before include "Began; flinched" , "Began, jumped" , "Originated" , "showed surprise" , "kicked-off" .)