13a Understand reason for Paddy and girl keeping a poster in Dublin house
(6,7) ??A?E? / E???A?N third letter of 2nd word could be R if doodler is correct for 6d : Increasingly lazy, take no action perhaps to replace current linesman (7)
2d Noble Vermonter initially behind American bottle banks (9) ??L?????R
11a S. American trumpeter finishes off salsa, playing aria from ernani (5) ????I