Edible tuber featuring in many a meal (3)
I believe the answer is:
yam
'edible tuber' is the definition.
(yam is a type of tuber)
'in many a meal' is the wordplay.
'in' says the answer is hidden in the clue.
'YAM' is hidden within 'many a meal'.
'featuring' acts as a link.
(Other definitions for yam that I've seen before include "Tuberous vegetable" , "Tropical tuber" , "Potato-like vegetable" , "May be a sweet potato" , "May be a sweet spud" .)