Pub encounters ordeal regularly finding keg (6)
I believe the answer is:
barrel
'keg' is the definition.
(thesaurus)
'pub encounters ordeal regularly' is the wordplay.
'pub' becomes 'bar' (I've seen this before).
'encounters' is a charade indicator (letters next to each other).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'ordeal' are 'rel'.
'bar'+'rel'='BARREL'
'finding' acts as a link.
(Other definitions for barrel that I've seen before include "Revolving drum" , "Tube of a gun" , "Round wooden vessel." , "Container for beer etc" , "''Roll out the ..., let's have a ... of fun'' (WWII song)" .)