Lean nurse (4)
I believe the answer is:
I believe this is a double definition.
'lean' is the first definition.
(I know that lean can be written as tend)
'nurse' is the second definition.
(tend can mean to nurse or look after)
(Other definitions for tend that I've seen before include "Wait on" , "Be inclined - look after" , "Look after (the sick)" , "Be predisposed, or care for" , "Look after (a patient)" .)