Fruit ingredients of pavlova must astonish when put on the counter (7)
I believe the answer is:
satsuma
'fruit' is the definition.
(satsuma is a kind of fruit)
'ingredients of pavlova must astonish when put on the counter' is the wordplay.
'SATSUMA' is hidden back-to-front in amongst the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for satsuma that I've seen before include "Seasonal orange" , "Variety of tangerine" , "Seedless citrus fruit" , "Loose-skinned fruit" , "Kind of mandarin orange" .)