Rhinoplasty effectively conceals swelling (4)
I believe the answer is:
stye
'swelling' is the definition.
(I've seen this before)
'rhinoplasty effectively conceals' is the wordplay.
'conceals' indicates a hidden word.
'STYE' can be found hidden inside 'rhinoplasty effectively'.
(Other definitions for stye that I've seen before include "Red eye" , "Climb" , "irritation to the viewer" , "Eyelid affliction" , "Inflammation around the eye" .)