They entertain camp old soldiers (8)
I believe the answer is:
redcoats
I believe this clue is a double definition.
'they entertain camp' is the first definition.
(entertainers at Butlin's holiday camps)
'old soldiers' is the second definition.
(Other definitions for redcoats that I've seen before include "Old British soldiers in colourful uniforms" , "men who used to fight for Britain" , "British soldiers during the American revolution" .)