Hospital department with frozen treats is alluring! (7)
I believe the answer is:
entices
'is alluring' is the definition.
(to entice is to be alluring)
'hospital department with frozen treats' is the wordplay.
'hospital department' becomes 'ENT' (Ear, Nose and Throat department).
'with' says to put letters next to each other.
'frozen treats' becomes 'ices' (I've seen this in another clue).
'ent'+'ices'='ENTICES'
(Other definitions for entices that I've seen before include "Persuades with pleasant offer" , "'Lures, tempts (7)'" , "Lures or beguiles" .)