Crossword Genius

Rook on wet earth trapped by head islander (8)

Ross

I believe the answer is:

bermudan

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

'islander' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'rook on wet earth trapped by head' is the wordplay.
'rook' becomes 'R' (chess abbreviation).
'on' is a charade indicator (letters next to each other).
'wet earth' becomes 'mud' (I've seen this before).
'trapped by' indicates putting letters inside.
'head' becomes 'bean' (bean is a kind of head).
'r'+'mud'='rmud'
'rmud' put into 'bean' is 'BERMUDAN'.

Can you help me to learn more?

(Other definitions for bermudan that I've seen before include "Pour out copiously" , "Coming from an island" .)

I've seen this clue in The Independent.
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