Dagger from old non-Arab country (6)
I believe the answer is:
obelus
'dagger' is the definition.
(I've seen this before)
'old non-arab country' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'non-arab' becomes 'bel' (I can't explain this - if you can you should give a lot more credence to this answer).
'country' becomes 'us' (US is an example).
'o'+'bel'+'us'='OBELUS'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for obelus that I've seen before include "Dagger-shaped mark" , "It indicates corruption!" , "Dagger symbol" , "Dagger, in printing, to indicate a footnote" , "Printer's dagger" .)