Santa can be far from saintly! (5)

I believe the answer is:

satan

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

'far from saintly' is the definition.
I can't judge whether this defines the answer.

'santa can be' is the wordplay.
'can be' indicates an anagram.
'santa' is an anagram of 'SATAN'.

Can you help me to learn more?

(Other definitions for satan that I've seen before include "Apollyon" , "arch-fiend" , "Fallen archangel" , "Fiend" , "Old Nick, Lucifer or Beelzebub" .)

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