Harry succeeded in safe surroundings (6)
I believe the answer is:
pester
'harry' is the definition.
(both can mean to bother)
'succeeded in safe surroundings' is the wordplay.
'succeeded in' becomes 's' (genealogical abbreviation. I am not sure about the 'in' bit.).
'safe' becomes 'peter' (I've seen this before).
'surroundings' indicates putting letters inside.
's' put inside 'peter' is 'PESTER'.
(Other definitions for pester that I've seen before include "Be a nuisance, annoy with requests" , "Annoy with frequent questions" , "Bug" , "Keep bothering" , "Trouble, annoy" .)