Such sauce seems soppy but not very soft (3)
I believe the answer is:
soy
'such sauce' is the definition.
'soy' can be an answer for 'sauce' (soy sauce). I'm unsure of the 'such' bit.
'soppy but not very soft' is the wordplay.
'but not' suggests deleting specific letters.
'very soft' becomes 'pp' (musical abbreviation for pianissimo).
'soppy' with 'pp' taken out is 'SOY'.
'seems' acts as a link.
Can you help me to learn more?
(Other definitions for soy that I've seen before include "Sauce bean" , "Piquant eastern sauce" , "Oriental sauce" , "Dark salty sauce" , "Chinese sauce" .)