Put a certain slant on It girl saving lives (9)
I believe the answer is:
italicise
'put a certain slant on' is the definition.
(italic script is slanted)
'it girl saving lives' is the wordplay.
'girl' becomes 'alice' (girl's name).
'saving' indicates putting letters inside.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'alice' placed around 'is' is 'alicise'.
'it'+'alicise'='ITALICISE'
(Other definitions for italicise that I've seen before include "Print in sloping letters" , "change appearance of character" , "make its characters right-leaning?" , "not use an upright type" , "How printers emphasise" .)