Japanese art in old Baltic capital makes impact at first (7)
I believe the answer is:
origami
'japanese art' is the definition.
(I've seen this before)
'old baltic capital makes impact at first' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'baltic capital' becomes 'riga' (I've seen this before).
'at first' says to take the initial letters.
The initial letters of 'makes impact' is 'mi'.
'o'+'riga'+'mi'='ORIGAMI'
'in' acts as a link.
(Other definitions for origami that I've seen before include "Japanese craft of paper-tearing" , "I'm a giro (anag)" , "Japanese art of folding or tearing paper" , "Delicate operations" , "Japanese paper-folding art" .)