Wonderful hospital leaving well-funded structure (6)
I believe the answer is:
fabric
'structure' is the definition.
(fabric is a kind of structure)
'wonderful hospital leaving well-funded' is the wordplay.
'wonderful' becomes 'fab' (slang abbreviation of fabulous).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'leaving' indicates named letters should be taken away.
'well-funded' becomes 'rich' (with lots of funds).
'rich' with 'h' taken out is 'ric'.
'fab'+'ric'='FABRIC'
(Other definitions for fabric that I've seen before include "Woven or knitted material" , "Underlying structure" , "Building structure; textile" , "Silk or satin, say" , "Manufactured cloth" .)