Simulated pressure on nurse (7)
I believe the answer is:
pretend
'simulated' is the definition.
(I've seen this in another clue)
'pressure on nurse' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'on' becomes 're' ('on' can be mean 'with reference to').
'nurse' becomes 'tend' (tend can mean to nurse or look after).
'p'+'re'+'tend'='PRETEND'
(Other definitions for pretend that I've seen before include "Behave unnaturally" , "keep up appearances" , "Imaginary, make-believe" , "Dissemble" , "Sham" .)