On what notices are often on (6)
I believe the answer is:
aboard
'on' is the definition.
Both the definition and answer are adverbs. Maybe there's a link between them I don't understand?
'notices are often on' is the wordplay.
I cannot really understand how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is located in the answer.
The remaining letters 'board' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'what' is the link.
Can you help me to learn more?
(Other definitions for aboard that I've seen before include "Joined for mutual benefit" , "on a yacht maybe" , "on deck" , "A poet penning nothing on vessel" , "on a ferry?" .)