Trumpet has place in window (6)
I believe the answer is:
splash
'trumpet' is the definition.
(I've seen this before)
'place in window' is the wordplay.
'place' becomes 'pl' (I've seen this in other clues).
'in' indicates putting letters inside.
'window' becomes 'sash' (I've seen this before).
'pl' going inside 'sash' is 'SPLASH'.
'has' acts as a link.
(Other definitions for splash that I've seen before include "Effect of hitting water (or headlines!)" , "Water raised by blow" , "Trumpet" , "Cause water to fly about, make wet" , "Sound of an object hitting liquid" .)