Fennellike herb (5)
I believe the answer is:
anise
'fennellike herb' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anise that I've seen before include "Plant with aromatic seeds" , "Plant providing flavour similar to liquorice" , "Herb with aromatic seeds" , "Plant with liquorice-flavoured seeds" , "Plant with seeds used as flavouring" .)