Based on the clue 'a section of growing grass roots cut from the gro...', what is the answer?

Based on the clue 'a secret message from this german foreign secretar...', what is the answer? Based on the clue 'a secret school in the clouds for superhero kids i...', what is the answer? What is referred to by 'a secreting cell mass'? Based on the clue 'a section of a journey separated from the other se...', what is the answer? Based on the clue 'a section of ice flatter than a berg that breaks o...', what is the answer? Based on the clue 'a section of oman separated from the rest of the c...', what is the answer? Based on the clue 'a security system designed to prevent unwelcome ha...', what is the answer? Based on the clue 'a sedge is a group of these birds perhaps the sand...', what is the answer?