Group of soldiers to some extent flip at rollicking (6)
I believe the answer is:
patrol
'group of soldiers' is the definition.
(patrol can mean a group of soldiers)
'to some extent flip at rollicking' is the wordplay.
'to some extent' says the answer is hidden in the clue (I've seen 'extent of' mean this (I've seen this in other clues)).
'PATROL' is hidden within 'flip at rollicking'.
(Other definitions for patrol that I've seen before include "Move around an area to watch or protect" , "Part of Scouts troop" , "Detachment for security or reconnaissance" , "Scouts or Guides group" , "Move round and keep watch" .)