She has since got caught in a pack of lies (6)
I believe the answer is:
lassie
'she has since' is the definition.
I can't tell whether this defines the answer.
'caught in a pack of lies' is the wordplay.
'caught in' becomes 'as' (I can't explain this - if you can you should believe this answer much more).
'a pack' indicates putting letters inside.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'lies' is an anagram of 'lsie'.
'as' put into 'lsie' is 'LASSIE'.
'got' is the link.
Can you help me to learn more?
(Other definitions for lassie that I've seen before include "TV series/film dog" , "TV series collie dog" , "Young Scottish female" , "Film and TV dog" , "Collie featuring in many films" .)