Provide care for a small charge (7)
(Other definitions for baby-sit that I've seen before include "Tend" , "Look after youngsters" , "Look after young children" , "Take charge to allow parents to go out" , "Look after children temporarily" .)
'charge' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Maybe you can see a link between them that I don't see?
'provide care for a small' is the wordplay.
'provide care' becomes 'sit' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for' says to put letters next to each other (I've seen this in other clues).
'a small' becomes 'baby'.
'sit' after 'baby' is 'BABYSIT'.
Can you help me to learn more?
(Other definitions for babysit that I've seen before include "Mind" , "Tend to kid" , "Look after children temporarily" , "Take charge to allow parents to go out" , "Supervise in loco parentis" .)