Saturate too much (5)
I believe the answer is:
steep
This clue is a double definition.
'saturate' is the first definition.
(steeping is a kind of saturating)
'too much' is the second definition.
(thesaurus)
(Other definitions for steep that I've seen before include "Precipitous - exorbitant" , "Sharply inclined" , "Saturate; precipitous" , "Marinate" , "Rapidly rising" .)