Nanny imposing end to extra pocket money (7)
I believe the answer is:
grandma
'nanny' is the definition.
(I've seen this before)
'imposing end to extra pocket money' is the wordplay.
'imposing' becomes 'grand' (I've seen this before).
'end to' indicates one should take the final letters.
'pocket' indicates putting letters inside.
'money' becomes 'm' (abbreviation in economics**).
The last letter of 'extra' is 'a'.
'grand'+'a'='granda'
'granda' enclosing 'm' is 'GRANDMA'.
(Other definitions for grandma that I've seen before include "Female in the family" , "Female relative" , "Drag man to his relative" , "Older relative" , "Parent's mother" .)