An infesting ring that may be in girl's hair (5,4)

I believe the answer is:

alice band

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'that may be in girl's hair' is the definition.
(an Alice band may hold back one's hair)

'an infesting ring' is the wordplay.
'an infesting' becomes 'alice' (I can't explain this - if you can you should give a lot more credence to this answer).
'ring' becomes 'band' (synonyms).
'alice'+'band'='ALICE BAND'

Can you help me to learn more?

(Other definitions for alice band that I've seen before include "headwear" , "overhead arch" , "may be found in the hair" , "this on girl's head" , "that contains shock?" .)

I've seen this clue in The Guardian.

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