Parent briefly next to opening of sett, feeding badger (7)
I believe the answer is:
babysit
'parent briefly' is the definition.
'next to opening of sett feeding badger' is the wordplay.
'next to' becomes 'by'.
'opening of' suggests taking the first letters.
'feeding' means one lot of letters goes inside another.
'badger' becomes 'bait' (both can mean to irritate).
The initial letter of 'sett' is 's'.
'by'+'s'='bys'
'bys' put into 'bait' is 'BABYSIT'.
(Other definitions for babysit that I've seen before include "Supervise in loco parentis" , "Tend to kid" , "Mind" , "Look after children temporarily" , "Take charge to allow parents to go out" .)