Sports ground: admit us somehow (7)
I believe the answer is:
stadium
'sports ground' is the definition.
(I've seen this before)
'admit us somehow' is the wordplay.
'somehow' indicates an anagram.
'admit'+'us'='admitus'
'admitus' anagrammed gives 'STADIUM'.
(Other definitions for stadium that I've seen before include "Large structure for open-air sports" , "bowl?" , "A major sports ground" , "Sports arena" , "Venue for sporting events, concerts etc" .)