Last 3 on Mon FT
5a Course not taken in mixed-ability group (6) ?T?E?1
8d Omit part of text, reportedly, being set out wrongly (8) 1?S?2?G?
13a Parasite’s head attaches to tail of bird (5) O?S?2
Where the numbers (1 and 2) indicate common letters.
Struggling any gentle hints would be appreciated