Wife leaving Norwich, travelling with British Airways (7)
I believe the answer is:
bronchi
'airways' is the definition.
(I've seen this before)
'wife leaving norwich travelling with british' is the wordplay.
'wife' becomes 'w' (abbreviation).
'leaving' indicates named letters should be taken away.
'travelling with' is an anagram indicator.
'british' becomes 'b' (abbreviation e.g. in BBC).
'norwich' with 'w' removed is 'norich'.
'norich' anagrammed with 'b' can make 'BRONCHI'.
(Other definitions for bronchi that I've seen before include "Air passages" , "Branches of the windpipe" , "In airways" , "airy spaces" , "breathers" .)