Hospitals covering up own goal was nonsense (7)
I believe the answer is:
hogwash
'nonsense' is the definition.
(I've seen this before)
'hospitals covering up own goal was' is the wordplay.
'hospitals' becomes 'hh' (an abbreviation for hospital written twice).
'covering up' indicates putting letters inside.
'own goal' becomes 'OG' (football abbreviation).
'og'+'was'='ogwas'
'hh' placed around 'ogwas' is 'HOGWASH'.
(Other definitions for hogwash that I've seen before include "Utter rubbish" , "Piffle" , "Bunkum" , "Pig food" , "garbage" .)