Am insured to cook for nanny (9)
I believe the answer is:
nursemaid
'nanny' is the definition.
('nursemaid' can be a synonym of 'nanny')
'am insured to cook' is the wordplay.
'to cook' indicates anagramming the letters.
'am'+'insured'='aminsured'
'aminsured' with letters rearranged gives 'NURSEMAID'.
'for' is the link.
(Other definitions for nursemaid that I've seen before include "tender" , "employ one for small charge" , "One employed to care for small children" , "One looking after children" , "Be overprotective towards (someone)" .)