12a) Herge character's not in colour (4) ?I?T
16a) Study unpleasant smell in summerhouse (6) ???E?O
13d) Man, thespian, hides female criminal (10) ???E?A????
18d) Achilles heel you and I notice about a monarch (4,4) WE?K ????
28a) Pocket woman's British plant (7) ????E?B
All help greatly appreciated