Pancake, wrong one everyone picked up (8)
I believe the answer is:
tortilla
'pancake' is the definition.
(tortilla is a kind of pancake)
'wrong one everyone picked up' is the wordplay.
'wrong' becomes 'tort' (legal term**).
'one' becomes 'i' (Roman numeral).
'everyone' becomes 'all' (I've seen this before).
'picked up' shows that the letters should be reversed in order.
'all' written backwards gives 'lla'.
'tort'+'i'+'lla'='TORTILLA'
(Other definitions for tortilla that I've seen before include "Mexican flatbread" , "Cake including maize" , "Mexican 7 across" , "Mexican snack" , "Mexican filled pancake" .)