Mayonnaise-like sauce (5,5)
I believe the answer is:
salad cream
'sauce' is the definition.
(I've seen this before)
'mayonnaise-like' is the wordplay.
I cannot really see how this works, but
'like' could be 'ala' (I've seen this in another clue) and 'ala' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for salad cream that I've seen before include "Sauce" , "Dressing like mayonnaise" .)