Yes going by dirty place that's frothy (6)
I believe the answer is:
yeasty
'frothy' is the definition.
(thesaurus)
'yes going by dirty place' is the wordplay.
'yes' becomes 'yea' (I've seen this before).
'going by' is a charade indicator (letters next to each other).
'dirty place' becomes 'sty' (I've seen this in other clues).
'yea'+'sty'='YEASTY'
'that's' is the link.
(Other definitions for yeasty that I've seen before include "Turbulent, restless; fermenting" , "Like a fermenting agent" , "bubbly" , "Frothy - insubstantial" , "Like taste of home brew" .)