Old nurse had my pill that we must dissolve (4,4,3,4)
I believe the answer is:
lady with the lamp
'old nurse' is the definition.
(I know that Lady with the Lamp is a nurse)
'had my pill that we must dissolve' is the wordplay.
'had my pill that we' can be anagrammed to 'LADY WITH THE LAMP'.
Though, I am not sure how the anagram is indicated.
Can you help me to learn more?
I've seen this clue in The Times.
Want a hint initially instead of a full solution?
Install my app