Boring routine of lady leaving hospital (3)
I believe the answer is:
rut
'boring routine' is the definition.
(I've seen this in another clue)
'lady leaving hospital' is the wordplay.
'lady' becomes 'ruth' (woman's name).
'leaving' indicates named letters should be taken away.
'hospital' becomes 'h' (abbreviation for hospital on maps).
'ruth' with 'h' taken away is 'RUT'.
'of' acts as a link.
(Other definitions for rut that I've seen before include "deer find it exciting" , "Wheel-made furrow" , "Deep track or tedious way of life" , "Mating period for deer" , "Groove worn in surface" .)