Recalled master geriatrician harbouring sorrowful thoughts (7)
I believe the answer is:
regrets
'sorrowful thoughts' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.
'recalled master geriatrician harbouring' is the wordplay.
'recalled' says the letters should be written backwards (to recall can mean to bring something back).
'harbouring' says the answer is hidden in the clue.
'sterger' is hidden in the letters of 'master geriatrician'.
'sterger' reversed gives 'REGRETS'.
Can you help me to learn more?
(Other definitions for regrets that I've seen before include "Sorrows" , "Rues" , "Bemoans" .)