Some fleabag has them horrified (6)
I believe the answer is:
aghast
'horrified' is the definition.
(thesaurus)
'some fleabag has them' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'AGHAST' is hidden within 'fleabag has them'.
(Other definitions for aghast that I've seen before include "Stupefied with horror" , "Struck with horror" , "struck with fear" , "Stupefied with horrer" , "Horrified, filled iwth consternation" .)