Tube train home cancelled? South Western shall accommodate (5)
I believe the answer is:
straw
'tube' is the definition.
(thesaurus)
'train home cancelled? south western shall accommodate' is the wordplay.
I cannot quite see how this works, but
'south' could be 's' (abbreviation) and 's' is found in the answer.
'western' could be 'w' and 'w' is found within the answer.
The remaining letters 'tra' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for straw that I've seen before include "Plant fibre used as fodder" , "The last one broke the camel's back" , "corny stuff" , "What a sucker gets given" , "Dry stalks" .)