Caught sickly nurse opening bathroom (2,5)
I believe the answer is:
en suite
'bathroom' is the definition.
(I've seen this before)
'caught sickly nurse opening' is the wordplay.
'caught' indicates a 'sounds like' (homophone) clue (heard).
'sickly' becomes 'sweet' (sickly can mean overly sweet).
'nurse' becomes 'EN' (abbreviation for enrolled nurse).
'opening' is a charade indicator (letters next to each other) (some letters appear before or 'open' others).
'sweet' sounds like 'suite'.
'suite' put after 'en' is 'EN SUITE'.
(Other definitions for en suite that I've seen before include "Like bathrooms next to bedrooms" , "Attached as part of a unit, bathroom say" , "Together by bedroom" , "Forming a single unit, like bedroom and bathroom" , "(Of bathroom) connected to the bedroom" .)