Tradesman opening regularly for business? (9)
I believe the answer is:
locksmith
'tradesman' is the definition.
(locksmith is a type of tradesman)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for locksmith that I've seen before include "Security worker" , "Security expert" , "opener" , "Yale scholar" , "key figure" .)