In Ireland I am reminded about mythical creature (7)
I believe the answer is:
mermaid
'mythical creature' is the definition.
(mythical sea creature)
'in ireland i am reminded about' is the wordplay.
'in' indicates the answer is hidden within the clue.
'about' says the letters should be written backwards.
'diamrem' is hidden in the letters of 'ireland i am reminded'.
'diamrem' back-to-front is 'MERMAID'.
(Other definitions for mermaid that I've seen before include "London theatre?" , "'Half woman, half fish (7)'" , "siren" , "Bird with a fish's tail" , "Woman-fish" .)