After power, etc? Put in top ingredient like vinegar (6)
I believe the answer is:
acetic
'like vinegar' is the definition.
(I've seen this in another clue)
'after power etc? put in top ingredient' is the wordplay.
'after' means one lot of letters go next to another.
'power' becomes 'ac' (AC is an example).
'put in' means one lot of letters goes inside another (instruction to solver).
'top' says to take the initial letters.
The initial letter of 'ingredient' is 'i'.
'etc' going around 'i' is 'etic'.
'ac' put next to 'etic' is 'ACETIC'.
(Other definitions for acetic that I've seen before include "Saucy'" , "really sour" , "sort of acid" , "Vinegar-like" , "tart" .)