Straight with both sides of Hawaiian island (4)
I believe the answer is:
hand
'straight' is the definition.
(thesaurus)
'with both sides of hawaiian island' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'and' and 'and' is present in the answer.
A single letter 'h' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hand that I've seen before include "Mitt" , "For example, a straight" , "audience response?" , "Worker - penmanship - four inches" , "Round of applause" .)