Ridiculous piece nurse cuts off having opened Uncle Sam's zip? (8,5)
I believe the answer is:
nonsense verse
'uncle sam's zip?' is the definition.
I can't tell whether this definition defines the answer.
'ridiculous piece nurse cuts off having opened' is the wordplay.
'ridiculous piece' becomes 'none' (I am not sure about this - if you are sure you should believe this answer much more).
'nurse' becomes 'sen' (abbreviation for Senior Enrolled Nurse).
'cuts off' becomes 'severs' (I've seen this before).
'having opened' is an insertion indicator (some letters open a gap in others).
'sen'+'severs'='sensevers'
'none' placed around 'sensevers' is 'NONSENSE VERSE'.
Can you help me to learn more?
(Other definitions for nonsense verse that I've seen before include "Absurd poetry" , "Trifling ditty by fool" , "Work by Edward Lear?" , "something from Lear" , "Edward Lear speciality" .)