Rummaged for a slice of pomme de terre frite from the east (8)
I believe the answer is:
ferreted
'rummaged for a slice of pomme' is the definition.
I can't judge whether this defines the answer.
'de terre frite from the east' is the wordplay.
'frite' becomes 'f' (this could be a standard abbreviation I've not previously seen).
'from the east' is a reversal indicator.
'de'+'terre'+'f'='deterref'
'deterref' reversed gives 'FERRETED'.
Can you help me to learn more?
(Other definitions for ferreted that I've seen before include "Searched (for something) in a place or container" , "Hunted about" .)