Based on the clue 'add a letter to glen you can take it in this way ...', what is the answer?

Based on the clue 'add a letter to a word for a product of mount etna...', what is the answer? Based on the clue 'add a letter to a word meaning an assembly of witc...', what is the answer? Based on the clue 'add a letter to came to get this word for a minor ...', what is the answer? Based on the clue 'add a letter to crime you get this peninsula in s...', what is the answer? Based on the clue 'add a letter to hotel you end up with this less e...', what is the answer? Based on the clue 'add a letter to ignite it becomes this brown coal', what is the answer? Based on the clue 'add a letter to lien you get this word for a fore...', what is the answer? Based on the clue 'add a letter to neuron instead of a nerve cell it...', what is the answer?