From hospital yard, mountains and a bush can be seen (9)
I believe the answer is:
hydrangea
'bush can be seen' is the definition.
I can't judge whether this defines the answer.
'from hospital yard mountains and a' is the wordplay.
'from' is an anagram indicator (from the letters).
'hospital' becomes 'H' (abbreviation for hospital on maps).
'mountains' becomes 'nge' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'h'+'yard'='hyard'
'hyard' is an anagram of 'hydra'.
'hydra'+'nge'+'a'='HYDRANGEA'
(Other definitions for hydrangea that I've seen before include "Flower you would find in garden hay" , "Flower you might find in garden hay, oddly" , "This flower is strangely a hay danger" , "Shrub - garden hay (anag)" , "Shrubby plant with showy flowers" .)