A backward numskull is unconcerned (5)

I believe the answer is:

aloof

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'unconcerned' is the definition.
(I've seen this in another clue)

'a backward numskull' is the wordplay.
'backward numskull' becomes 'loof' (I can't justify this - if you can you should believe this answer much more).
'a'+'loof'='ALOOF'

'is' is the link.

Can you help me to learn more?

(Other definitions for aloof that I've seen before include "Remote in manner" , "Remote, distant" , "Withdrawn, distant" , "Disinterested" , "A fool being cool and remote" .)

I've seen this clue in The Irish Independent.

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