Like that German, and so fit! (5)
I believe the answer is:
sound
'fit' is the definition.
(associated in meaning)
'like that german and' is the wordplay.
'like that' becomes 'so' (as in 'like so').
'german and' becomes 'und' ('and' in German).
'so'+'und'='SOUND'
'so' is the link.
(Other definitions for sound that I've seen before include "Measure depth" , "stretch of water" , "Not diseased or damaged - listen" , "Fit" , "well" .)