Capture entertaining ace sporting bun (7)
I believe the answer is:
teacake
'bun' is the definition.
(type of bun)
'capture entertaining ace sporting' is the wordplay.
'capture' becomes 'take' (I've seen this before).
'entertaining' indicates putting letters inside (inviting in, as for dinner).
'sporting' indicates an anagram.
'ace' is an anagram of 'eac'.
'take' enclosing 'eac' is 'TEACAKE'.
(Other definitions for teacake that I've seen before include "Afternoon food?" , "food item" , "Scones with raisins, toasted and buttered" , "Something to eat in the afternoon?" , "Sweet bun" .)