Doctor rings, getting pressure to subside (5)
I believe the answer is:
droop
'subside' is the definition.
(thesaurus)
'doctor rings getting pressure' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'rings' becomes 'oo' (two O's - O resembles a ring).
'getting' is a charade indicator (letters next to each other).
'pressure' becomes 'p' (scientific abbreviation).
'dr'+'oo'+'p'='DROOP'
'to' is the link.
(Other definitions for droop that I've seen before include "Hang downwards, lose strength or spirit" , "Dangle" , "Sag wearily" , "male problem?" , "Sag downwards" .)