Herb from bog by north-eastern lake (6)
I believe the answer is:
fennel
'herb' is the definition.
(fennel is a kind of herb)
'bog by north-eastern lake' is the wordplay.
'bog' becomes 'fen'.
'by' means one lot of letters go next to another.
'north' becomes 'n' ('N' can be a synonym of 'north').
'eastern' becomes 'e'.
'lake' becomes 'l'.
'fen'+'n'+'e'+'l'='FENNEL'
'from' is the link.
(Other definitions for fennel that I've seen before include "...and an aromatic flavourful herb" , "Culinary herb" , "Edible plant" , "Plant used for flavouring, such as finocchio" , "Fragrant herb" .)