Raised energy, endeavour and turnover, say (6)
I believe the answer is:
pastry
'turnover say' is the definition.
(turnover is a kind of pastry)
'raised energy endeavour' is the wordplay.
'raised' shows that the letters should be reversed in order.
'energy' becomes 'sap' (I've seen this before).
'endeavour' becomes 'try' ('try' can be a synonym of 'endeavour').
'sap' in reverse letter order is 'pas'.
'pas'+'try'='PASTRY'
'and' is the link.
(Other definitions for pastry that I've seen before include "Cake - tart" , "Choux --; puff --" , "Dough used in pie-cases" , "Cooked dough" , "Dough for baking" .)