Covering article smuggled aboard by pirate (6)
I believe the answer is:
canopy
'covering' is the definition.
(canopy is a kind of covering)
'article smuggled aboard by pirate' is the wordplay.
'article' becomes 'an' (indefinite article).
'smuggled aboard' indicates putting letters inside (I've seen this in other clues).
'by pirate' becomes 'copy' (I can't justify this - if you can you should give a lot more credence to this answer).
'an' going inside 'copy' is 'CANOPY'.
Can you help me to learn more?
(Other definitions for canopy that I've seen before include "Covering serving as shelter" , "Covering against sun or rain" , "Ceremonial covering" , "Ornamental covering" , "Hanging cover over bed, shopfront, etc" .)