A bit rusty like a retired doctor (3,2,8)
I believe the answer is:
out of practice
'a bit rusty like a retired doctor' is the definition.
I can't judge whether this defines the answer.
'bit rusty like a retired doctor' is the wordplay.
I cannot really understand how this works, but
'bit' could be 'act' (synonyms) and 'act' is found in the answer.
'retired' could be 'out' (synonyms) and 'out' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for out of practice that I've seen before include "Like a doctor dismissed" , "being rusty?" .)