Pill taken at the start on board (6)
I believe the answer is:
tablet
'pill' is the definition.
(I know that pill can be written as tablet)
'taken at the start on board' is the wordplay.
'at the start' suggests taking the first letters.
'on' says to put letters next to each other.
'board' becomes 'table' (both can mean food).
The initial letter of 'taken' is 't'.
't' after 'table' is 'TABLET'.
(Other definitions for tablet that I've seen before include "Weekly" , "Small pill or lozenge" , "Pill; computer" , "panel with an inscription" , "Small slab or flat pill" .)