Letter from abroad captures skilful pictorial representation (7)
I believe the answer is:
tableau
'pictorial representation' is the definition.
'tableau' can be an answer for 'representation' (thesaurus). I am unsure of the 'pictorial' bit.
'letter from abroad captures skilful' is the wordplay.
'letter from abroad' becomes 'tau' (I can't explain this - if you can you should give a lot more credence to this answer).
'captures' means one lot of letters goes inside another.
'skilful' becomes 'able' (I've seen this before).
'tau' enclosing 'able' is 'TABLEAU'.
Can you help me to learn more?
(Other definitions for tableau that I've seen before include "Pageant" , "Scene of still figures" , "'Frozen' theatrical scene" , "Group of people arranged as for a painting say" , "still life?" .)