Tell Her Majesty to become a shopkeeper (8)
I believe the answer is:
retailer
'a shopkeeper' is the definition.
(thesaurus)
'tell her majesty' is the wordplay.
I cannot really see how this works, but
'her' could be 'reta' and 'reta' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'to become' acts as a link.
Can you help me to learn more?
(Other definitions for retailer that I've seen before include "Seller to the public" , "One selling to consumers" , "Seller, shopkeeper" , "Merchant" , "One who sells goods to the geneal public" .)