Open a container for ready-made sauce perhaps (4)
I believe the answer is:
ajar
'open' is the definition.
(similar in meaning)
'a container for ready-made sauce perhaps' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'container' could be 'jar' (jar is a kind of container) and 'jar' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ajar that I've seen before include "A litle bit open" , "(Of door) slightly open" , "Not quite shut" , "Part-open" , "letting in a little light?" .)