Flavour of ouzo, say, is filling a requirement (7)

I believe the answer is:

aniseed

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'flavour of ouzo' is the definition.
'aniseed' can be an answer for 'flavour' (I've seen this before). I'm unsure of the 'of ouzo' bit.

'is filling a requirement' is the wordplay.
'filling' means one lot of letters goes inside another.
'requirement' becomes 'need' (synonyms).
'a'+'need'='aneed'
'is' put within 'aneed' is 'ANISEED'.

'say' is the link.

Can you help me to learn more?

(Other definitions for aniseed that I've seen before include "Liquorice flavouring -- ie Danes (anag)" , "Strong herbal flavouring" , "Licorice-like flavour" , "Strong flavour" , "Liquorice flavouring, used in cookery" .)

I've seen this clue in The Telegraph.

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