Yorkshire river with last of water, drier (5)
I believe the answer is:
airer
'drier' is the definition.
(frame for airing wet clothes)
'yorkshire river with last of water' is the wordplay.
'yorkshire river' becomes 'Aire' (river in Yorkshire).
'with' means one lot of letters go next to another.
'last of' indicates one should take the final letters.
The final letter of 'water' is 'r'.
'aire'+'r'='AIRER'
(Other definitions for airer that I've seen before include "Frame on which clothes are dried" , "Broadcaster" , "What launderers may use" , "Frame for drying clothes" , "Clothes-horse" .)