Hospital department entertained by youngster kept unwillingly (4-2)
I believe the answer is:
pent-up
'kept unwillingly' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally mean the same thing.
'hospital department entertained by youngster' is the wordplay.
'hospital department' becomes 'ENT' (Ear, Nose and Throat department).
'entertained by' is an insertion indicator (inserted letters are hosted or entertained).
'youngster' becomes 'pup' (a pup is a young dog).
'ent' inserted inside 'pup' is 'PENT-UP'.
Can you help me to learn more?
(Other definitions for pent-up that I've seen before include "Held back, confined" , "Dammed or repressed" , "Russian city" , "Confined like feelings or water behind dam" , "Repressed, emotions say" .)