Swindle with pie lacking English seafood (6)
I believe the answer is:
scampi
'seafood' is the definition.
(I've seen this before)
'swindle with pie lacking english' is the wordplay.
'swindle' becomes 'scam' (scam is a kind of swindle).
'with' means one lot of letters go next to another.
'lacking' indicates named letters should be taken away.
'english' becomes 'e' (abbreviation).
'pie' with 'e' taken away is 'pi'.
'scam'+'pi'='SCAMPI'
(Other definitions for scampi that I've seen before include "Crumbed prawns" , "Cooked Norway lobsters" , "Breaded prawns" , "Shellfish" , "Dish of fried shrimps or prawns" .)