Father's attempt at filo, say (6)
I believe the answer is:
pastry
'filo say' is the definition.
(I know that phyllo is a type of pastry)
'father's attempt' is the wordplay.
'father's' becomes 'pa's' (pa can mean dad or father).
'attempt' becomes 'try' (synonyms).
'pas'+'try'='PASTRY'
'at' acts as a link.
(Other definitions for pastry that I've seen before include "Kind of baked food" , "Piecrust; small cake" , "Eg, pie crust" , "'It may be puff, shortcrust and flakey (6)'" , "Cooked dough" .)