The final effect is an exceptional lustre (6)

I believe the answer is:

result

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'the final effect' is the definition.
'result' can be an answer for 'effect' (synonyms). I am not sure about the 'the final' bit.

'an exceptional lustre' is the wordplay.
'an exceptional' is an anagram indicator (an unusual or exceptional ordering of the letters).
'lustre' with letters rearranged gives 'RESULT'.

'is' is the link.

Can you help me to learn more?

(Other definitions for result that I've seen before include "Final score" , "End - issue" , "Outcome of an undertaking" , "Ulster (anag) - outcome" , "Effect of lustre" .)

I've seen this clue in the Evening Standard.

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