It's not different to tritium and iodine found in Iceland? Wrong! (9)
I believe the answer is:
identical
'it's not different' is the definition.
I can't tell whether this defines the answer.
'tritium and iodine found in iceland? wrong' is the wordplay.
'tritium' becomes 'T' (abbreviation in chemistry).
'and' is a charade indicator (letters next to each other).
'iodine' becomes 'I' (chemical symbol).
'found in' indicates putting letters inside.
'wrong' indicates anagramming the letters.
't'+'i'='ti'
'iceland' anagrammed gives 'idencal'.
'ti' placed inside 'idencal' is 'IDENTICAL'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for identical that I've seen before include "Indistinguishable" , "Selfsame" , "Matching" , "as B and B" , "Exactly alike, the same in every detail" .)