OK Here we go:-
1across "Showing surprise on the square perhaps, deny a lie that's false" (7,2,6).
B---i-g/-n/-y---d.
9across "Having domain unsettled, getting about" (7). N-m-d-c. (Why Nomadic??)
10across "Foolish chap bagging a wooly jumper" (7). W-l-a-y. (Why Wallaby?).
19down "Person is standing up on seat" (7).
M-n-a-n.