Crossword Genius

Brooding giant oddly destroyed island into bananas (10)

Ross

I believe the answer is:

incubation

'brooding' is the definition.
(synonyms)

'giant oddly destroyed island into bananas' is the wordplay.
'oddly destroyed' indicates alternate letters (remove letters in odd-numbered positions).
'island' becomes 'cuba' (Cuba is an example).
'bananas' indicates anagramming the letters (informal term for mad).
The alternating letters of 'giant' are 'in'.
'into' is an anagram of 'tion'.
'in'+'cuba'+'tion'='INCUBATION'

I've seen this clue in The Telegraph.
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