Girl scoffing second pudding (8)
I believe the answer is:
semolina
'pudding' is the definition.
(I've seen this before)
'girl scoffing second' is the wordplay.
'girl' becomes 'selina' ().
'scoffing' is an insertion indicator.
'second' becomes 'mo' (both are short periods of time).
'selina' going around 'mo' is 'SEMOLINA'.
(Other definitions for semolina that I've seen before include "dessert" , "Cereal used for puddings" , "Hard grains of wheat in puddings and pasta" , "Wheat food found in a soil, men" , "Wheat product used in pasta" .)