The last to suffer when nurse comes round (4-3)

'nurse comes round' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'the last to suffer' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'last' becomes 'end' (I've seen this in another clue).
'to' says to put letters next to each other (I've seen this in other clues).
'suffer' becomes 'ail' (ailing is a kind of suffering).
'end' after 'ail' is 'ailend'.
't'+'ailend'='TAIL-END'

'when' is the link.

Can you help me to learn more?