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They may be largely responsible for children's nightmares (5)

Ross

I believe the answer is:

ogres

I'm a little stuck... Click here to teach me more about this clue!

'children's nightmares' is the definition.
I can't tell whether this definition defines the answer.

'they may be largely' is the wordplay.
'they may' becomes 'og' (I can't justify this - if you can you should believe this answer much more).
'be' becomes 'rest' (resting is a kind of being).
'largely' means to remove the last letter (most but not all of the letters).
'rest' with its last letter taken away is 'res'.
'og'+'res'='OGRES'

'responsible for' is the link.

Can you help me to learn more?

(Other definitions for ogres that I've seen before include "She-giant of fairy tale" , "Giants in fairytales" , "Giant types" , "'Monsters, fiends (5)'" , "Man-eating giants of folklore" .)

I've seen this clue in the Evening Standard.
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