The little man's hospital (5)
I believe the answer is:
barts
'hospital' is the definition.
(I've seen this before)
'the little man's' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'man's' could be 'bars' and 'bars' is present in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for barts that I've seen is " hospital".)