Where a doctor should show an interest, no matter what (2,3,4)
I believe the answer is:
in any case
'no matter what' is the definition.
(I've seen this in another clue)
'where a doctor should show an interest' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
'an' could be 'i' (Roman numeral for one) and 'i' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for in any case that I've seen before include "Lawyers may be so employed" , "Where a customs officer may search" , "At all events" , "No matter what" , "Whatever the facts are, whatever happens" .)