Ask Hector to cook something for tea (9)
I believe the answer is:
shortcake
'something for tea' is the definition.
(a shortcake might be eaten with tea)
'ask hector to cook' is the wordplay.
'to cook' is an anagram indicator.
'ask'+'hector'='askhector'
'askhector' is an anagram of 'SHORTCAKE'.
(Other definitions for shortcake that I've seen before include "pastry?" , "Rich type of biscuit" , "it crumbles!" , "Sweet biscuit - rat chokes (anag)" , "Crisp, rich, crumbly, buttery biscuit" .)