Stuck in top left-hand corner.
1dn, 'Call credit note underhand, so as to arouse suspicion' (9), ??????S?Y. 'Curiously'?
1ac, 'Harmful substance girl at home's swallowed neat', (6), ??O???;
14ac, 'Daring US investigator tended to in infancy', (6-3), ??T??? ??D;
16ac, 'Turned and exhaled loudly as player's flagged', ??F????': 'Offered'?
And what is 30ac, ' Toys mother received found in thank you letters from abroad', (11), T?M?G?T?H?S ?