The writer is expert at babel translation? Most unlikely (10)
I believe the answer is:
improbable
'most unlikely' is the definition.
'improbable' can be an answer for 'unlikely' (synonyms). I am not sure about the 'most' bit.
'the writer is expert at babel translation?' is the wordplay.
'the writer is' becomes 'I'm' ('I am', referring to the person who wrote the clue).
'expert' becomes 'pro' (short for professional).
'at' says to put letters next to each other.
'translation?' indicates anagramming the letters (I've seen 'translation' mean this).
'babel' with letters rearranged gives 'bable'.
'im'+'pro'+'bable'='IMPROBABLE'
Can you help me to learn more?
(Other definitions for improbable that I've seen before include "Not likely" , "Highly unlikely" , "Far-fetched" .)