Heading west, bats halt, reaching German conference venue (7)
I believe the answer is:
potsdam
'german conference venue' is the definition.
'heading west bats halt' is the wordplay.
'heading west' says the letters should be written in reverse.
'bats' becomes 'mad'.
'halt' becomes 'stop' (synonyms).
'mad'+'stop'='madstop'
'madstop' reversed gives 'POTSDAM'.
'reaching' is the link.
(Other definitions for potsdam that I've seen before include "conference city" , "1945 conference location" , "WW two 1945 conference; stop mad (anag.)" , "Site of WW2 conference" , "conference centre" .)