Tireless working to retain current doctor? (9)
I believe the answer is:
sterilise
'doctor?' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps there's an association between them I don't understand?
'tireless working to retain current' is the wordplay.
'working' is an anagram indicator.
'to retain' indicates putting letters inside.
'current' becomes 'I' (symbol for electric current).
'tireless' with letters rearranged gives 'sterilse'.
'sterilse' enclosing 'i' is 'STERILISE'.
Can you help me to learn more?
(Other definitions for sterilise that I've seen before include "Listerise (anag)" , "Disinfect" , "Make free from micro-organisms, like surgeon's knife" , "Make free from bacteria" , "Free from germs" .)