Obtain from strange tradesman (3)
I believe the answer is:
get
'obtain' is the definition.
(I know that obtain can be written as get)
'from strange tradesman' is the wordplay.
'from' says the answer is hidden in the clue.
'GET' can be found hidden inside 'strange tradesman'.
(Other definitions for get that I've seen before include "Escape" , "Procure or secure" , "Procure from vegetables" , "Understand" , "Receive; obtain" .)