The ranks in America showing regal dignity (11)
I believe the answer is:
stateliness
'regal dignity' is the definition.
'stateliness' can be an answer for 'dignity' (I've seen this before). I am not certain of the 'regal' bit.
'the ranks in america' is the wordplay.
'the ranks' becomes 'lines' (I've seen this before).
'in' is an insertion indicator.
'america' becomes 'states' (the United States).
'lines' going inside 'states' is 'STATELINESS'.
'showing' acts as a link.
Can you help me to learn more?
(Other definitions for stateliness that I've seen before include "dignity" , "nobility" , "Dignified and imposing quality" .)