Personal assistant’s attempt to make an éclair? (6)
I believe the answer is:
pastry
'an eclair?' is the definition.
(type of pastry)
'personal assistant's attempt' is the wordplay.
'personal assistant's' becomes 'PA's' (abbreviation).
'attempt' becomes 'try' (synonyms).
'pas'+'try'='PASTRY'
'to make' is the link.
(Other definitions for pastry that I've seen before include "Dough made from flour, fat and water" , "Eg, pie crust" , "Dough base" , "What makes crust" , "See 7 Down" .)