Broadcast supporting set welcoming hospital's invalid transport
I believe the answer is:
'invalid transport' is the definition.
(I've seen this before)
'broadcast supporting set welcoming hospital's' is the wordplay.
I cannot quite understand how this works, but
'broadcast' could be 'air' ('air' can be a synonym of 'broadcast') and 'air' is located in the answer.
'hospital' could be 'h' and 'h' is found in the answer.
'set' could be 'batch' (I've seen this before) and 'batch' is found in the leftover letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bath chair that I've seen before include "Invalid method of advance" , "post in SW university?" , "occupied by professor in South-West" , "Transport for a disabled person" , "Former invalid's carriage" .)