Strong flavouring eased in cooking (7)
I believe the answer is:
aniseed
'strong flavouring' is the definition.
(I've seen this before)
'eased in cooking' is the wordplay.
'cooking' indicates anagramming the letters.
'eased'+'in'='easedin'
'easedin' is an anagram of 'ANISEED'.
(Other definitions for aniseed that I've seen before include "Strong flavour" , "Die sane (anag)" , "Strong flavouring often used in sweets" , "Liquorice flavouring, used in cookery" , "Pernod flavouring" .)