Girl friends? Don't fancies run riot! (11)

I believe the answer is:

confidantes

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

'girl friends?' is the definition.
'confidantes' can be an answer for 'friends?' (confidante is a kind of friend). I am not sure about the 'girl' bit.

'don't fancies run riot' is the wordplay.
'don't fancies' anagrams to 'CONFIDANTES'.
However, I am unsure how this is indicated.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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