Pipe or rail oddly found in pub (5)
I believe the answer is:
briar
'pipe' is the definition.
(I've seen this before)
'rail oddly found in pub' is the wordplay.
'oddly' means one should take alternating letters.
'found in' indicates putting letters inside.
'pub' becomes 'bar' (I've seen this before).
The alternating letters of 'rail' are 'ri'.
'ri' placed inside 'bar' is 'BRIAR'.
'or' is the link.
(Other definitions for briar that I've seen before include "Tobacco pipe" , "Wild rose bush" , "that one may smoke" , "Wood used for pipes" , "Prickly wooden stem" .)