Duo I left floundering in the deep (8)
I believe the answer is:
outfield
'in the deep' is the definition.
(both can mean far from the wicket in cricket)
'duo i left floundering' is the wordplay.
'floundering' is an anagram indicator.
'duo'+'i'+'left'='duoileft'
'duoileft' anagrammed gives 'OUTFIELD'.
(Other definitions for outfield that I've seen before include "Distant region of cricket ground" , "Area away from the wicket" , "Part of pitch furthest from wicket" , "Area furthest from the stumps" .)