Swimmer ordered Cobra beer to be taken round (8)
I believe the answer is:
albacore
'swimmer' is the definition.
(albacore is a kind of fish)
'ordered cobra beer to be taken round' is the wordplay.
'ordered' indicates an anagram.
'beer' becomes 'ale' (type of beer).
'to be taken round' is an insertion indicator.
'cobra' anagrammed gives 'bacor'.
'bacor' going inside 'ale' is 'ALBACORE'.
(Other definitions for albacore that I've seen before include "Long-fin tunny" , "Variety of tuna" , "fish" , "Large tuna; able orca (anag.)" .)