Foul tide swirling 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)
'foul tide swirling' is the wordplay.
'swirling' is an anagram indicator (letters get swirled around).
'foul'+'tide'='foultide'
'foultide' with letters rearranged gives 'OUTFIELD'.
(Other definitions for outfield that I've seen before include "Area away from the wicket" , "Area furthest from the stumps" , "Distant region of cricket ground" , "Part of pitch furthest from wicket" .)