Flute Cafe stew is successful (9)

I believe the answer is:

effectual

I'm a little stuck... Click here to teach me more about this clue!

'successful' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

'flute cafe stew' is the wordplay.
'stew' indicates anagramming the letters.
'flute'+'cafe'='flutecafe'
'flutecafe' with letters rearranged gives 'EFFECTUAL'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for effectual that I've seen before include "Producing the desired result" , "productive" .)

I've seen this clue in the Sydney Morning Herald.

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