Be full of sickness, having dry bread (8)
I believe the answer is:
baguette
'bread' is the definition.
(baguette is a kind of bread)
'be full of sickness having dry' is the wordplay.
'full of' indicates putting letters inside.
'sickness' becomes 'ague' (ague is a kind of sickness).
'having' is a charade indicator (letters next to each other).
'dry' becomes 'tt' (abbreviation for teetotal).
'ague'+'tt'='aguett'
'be' going around 'aguett' is 'BAGUETTE'.
(Other definitions for baguette that I've seen before include "Bread roll" , "A long thin French loaf" , "Long French breadstick" , "Narrow French stick loaf" , "Long loaf - tube gate (anag)" .)