Caution girl (8)
I believe the answer is:
prudence
This clue is a double definition.
'caution' is the first definition.
(thesaurus)
'girl' is the second definition.
(Other definitions for prudence that I've seen before include "A woman < 's > circumspection" , "Wise caution" , "economy" , "Vigilance" , "Discretion, caution" .)