Crossword Genius

Misses alarm, perhaps, as crackpot pens lies (6,2)

Ross

I believe the answer is:

sleeps in

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

'misses alarm perhaps' is the definition.
I can't judge whether this defines the answer.

'crackpot pens lies' is the wordplay.
'crackpot' is an anagram indicator (an eccentric ordering of the letters).
'pens'+'lies'='penslies'
'penslies' is an anagram of 'SLEEPS IN'.

'as' is the link.

Can you help me to learn more?

(Another definition for sleeps in that I've seen is " ignores alarm?".)

I've seen this clue in The Times.
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