Big and obvious statement of identity with Poles — European (7)
I believe the answer is:
immense
'big' is the definition.
(similar in meaning)
'obvious statement of identity with poles european' is the wordplay.
I cannot really understand how this works, but
'poles' could be 'ns' (North and South poles) and 'ns' is located in the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is found within the answer.
This explanation may well be incorrect...
'and' acts as a link.
(Other definitions for immense that I've seen before include "'Gigantic, extensive (7)'" , "Massive" , "Huge, really great" , "Huge, very big indeed" , "Unusually great in size" .)