Nurse Pam is fantastic, no ordinary mortal! (8)
I believe the answer is:
superman
'no ordinary mortal' is the definition.
'superman' can be an answer for 'mortal' (superman is a kind of mortal). I am unsure of the 'no ordinary' bit.
'nurse pam is fantastic' is the wordplay.
'is fantastic' indicates an anagram (a fantastic or improbable ordering of the letters).
'nurse'+'pam'='nursepam'
'nursepam' with letters rearranged gives 'SUPERMAN'.
Can you help me to learn more?
(Other definitions for superman that I've seen before include "Clark Kent" , "Kent some time" , "Ideal male" , "Rescuing male" , "Crime-fighting hero" .)