Remember everyone at the sports ground (6)
I believe the answer is:
recall
'remember' is the definition.
('recall' can be a synonym of 'remember')
'everyone at the sports ground' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'at' means one lot of letters go next to another (I've seen this in other clues).
'the sports ground' becomes 'rec' (I've seen this in other clues).
'all' put after 'rec' is 'RECALL'.
(Other definitions for recall that I've seen before include "Don''t forget - come again" , "Get back" , "Hark back" , "Summon back - ability to remember" , "Evoke" .)