17a) Cheeses picked up? It's a doodle (6) ?R?E?E
18d) Writer's regrettably sent back sausage (6) no letters
21d) Courageous woman's in charge of holding ring (6) no letters
22a) It's a tight squeeze working in Canada for a change (8) ?N?C?N??
26a) Edit 'Virtue is Mild' i.e. to create plausibility (14) ?E?I?I?????U?E
All help greatly appreciated