Line in exotic cigar that’s strongly flavoured (6)
I believe the answer is:
garlic
'that's strongly flavoured' is the definition.
(garlic has a strong flavour)
'line in exotic cigar' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' is an insertion indicator.
'exotic' indicates anagramming the letters (an unusual form of the letters).
'cigar' anagrammed gives 'garic'.
'l' put inside 'garic' is 'GARLIC'.
(Other definitions for garlic that I've seen before include "Pungent bulb - vampires hate it" , "Culinary bulb" , "Pungent bulb hated by vampires" , "Vegetable" , "Food flavouring not favoured by vampires?" .)