Run through new canteen doorway (8)
I believe the answer is:
entrance
'doorway' is the definition.
(I've seen this before)
'run through new canteen' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'through' is an insertion indicator (inserted letters go through the word).
'new' indicates anagramming the letters.
'canteen' is an anagram of 'entance'.
'r' going into 'entance' is 'ENTRANCE'.
(Other definitions for entrance that I've seen before include "arrival" , "Coming upon stage - fill with rapturous delight" , "seventeen [POSTERN], perhaps" , "transport" , "Ingress" .)