Kindled again in barrel itself (5)
I believe the answer is:
relit
'kindled again' is the definition.
(I've seen this in another clue)
'in barrel itself' is the wordplay.
'in' indicates a hidden word.
'RELIT' is hidden in the letters of 'barrel itself'.
(Other definitions for relit that I've seen before include "in flames again" , "got going again" , "Tiler (anag.)" , "Again fired" , "Kindled anew" .)