Worry Peter as he tours the South (6)
I believe the answer is:
pester
'worry' is the definition.
(thesaurus)
'peter as he tours the south' is the wordplay.
I cannot really see how this works, but
'peter' could be 'st' (synonyms) and 'st' is located in the answer.
The remaining letters 'peer' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pester that I've seen before include "Harass" , "Nag, badger" , "Annoy with frequent requests" , "Trouble, annoy" , "Importune" .)