In Piedmont, her uncle's trying to avoid capture (2,3,3)
I believe the answer is:
on the run
'trying to avoid capture' is the definition.
(I've seen this before)
'in piedmont her uncle's' is the wordplay.
'in' indicates a hidden word.
'ON THE RUN' is hidden within 'piedmont her uncles'.
(Other definitions for on the run that I've seen before include "wanted by the police" , "In flight as from the police" , "Where bobsleigh competitor is found" , "Like fugitives" , "Pursued by the police" .)