Evening wear exactly right, laic surprisingly impressed (4,4)
I believe the answer is:
tail coat
'evening wear' is the definition.
'tail coat' can be an answer for 'wear' (tail coat is a kind of wear). I'm unsure of the 'evening' bit.
'exactly right laic surprisingly impressed' is the wordplay.
I cannot really understand how this works, but
an anagram of 'laic' is 'ailc' which is within the answer.
'exactly' could be 'toat' ('to a T' can mean exactly right) and 'toat' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tail coat that I've seen before include "item of clothing" , "Male formal dress" , "Man's formal wear" , "Man's formal jacket" .)