A bit insane; mad while not present (2,8)

I believe the answer is:

in absentia

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'while not present' is the definition.
I can't tell whether this defines the answer.

'a bit insane mad' is the wordplay.
'mad' indicates an anagram.
'a'+'bit'+'insane'='abitinsane'
'abitinsane' with letters rearranged gives 'IN ABSENTIA'.

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(Other definitions for in absentia that I've seen before include "Wanting an appearance" , "away" , "While not present (Latin)" , "not at event" .)

I've seen this clue in The Telegraph.

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