Crossword Genius

Showed surprise when a good man began a new trade (7)

Ross

I believe the answer is:

started

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'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" .)

I've seen this clue in The Globe and Mail.
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