Advice concerning article earlier — it might be taken on board (9)
I believe the answer is:
antipasto
'it might be taken on board' is the definition.
The definition suggests a singular noun which matches the answer.
'advice concerning article earlier' is the wordplay.
'advice' becomes 'tip' (a tip is a piece of advice).
'concerning' becomes 'as to' (I've seen this before).
'article' becomes 'an' (English indefinite article).
'earlier' means one lot of letters go next to another.
'tip'+'asto'='tipasto'
'tipasto' put after 'an' is 'ANTIPASTO'.
Can you help me to learn more?
(Other definitions for antipasto that I've seen before include "Italian food" , "Italian appetisers" , "garnish!" , "course leader" , "part of meal" .)