Island of irrational traumas (7)

I believe the answer is:

sumatra

'island' is the definition.
(Sumatra is an example)

'irrational traumas' is the wordplay.
'irrational' indicates anagramming the letters.
'traumas' anagrammed gives 'SUMATRA'.

'of' acts as a link.

(Other definitions for sumatra that I've seen before include "Some land" , "Eastern island" , "island in Indian ocean" , "Large Indonesian island" , "A US mart on an Indonesian island?" .)

I've seen this clue in the Evening Standard.

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