Electra stirred the syrup (7)
I believe the answer is:
treacle
'syrup' is the definition.
(I know that treacle is a type of syrup)
'electra stirred' is the wordplay.
'stirred' is an anagram indicator.
'electra' is an anagram of 'TREACLE'.
'the' acts as a link.
(Other definitions for treacle that I've seen before include "Sweet, black viscous substance" , "Syrup, molasses" , "Viscous liquid" , "Something cloyingly sweet" , "Sticky produce" .)