Lacklustre bananas I cut open (8)

I believe the answer is:

unpoetic

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'lacklustre' is the definition.
Both the answer and definition are adjectives.
Maybe there's an association between them I don't understand?

'bananas i cut open' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'i'+'cut'+'open'='icutopen'
'icutopen' anagrammed gives 'UNPOETIC'.

Can you help me to learn more?

(Other definitions for unpoetic that I've seen before include "Not in the style of verse" , "prosaic" .)

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

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