Who minds small charges? (11)

I believe the answer is:

babysitters

I'm a little stuck... Click here to teach me more about this clue!

'who minds' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'small charges?' is the wordplay.
'small' becomes 'baby'.
'charges?' becomes 'sitters' (I can't justify this - if you can you should believe this answer much more).
'baby'+'sitters'='BABYSITTERS'

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.

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