Stadium housing second Lima football team (7)
I believe the answer is:
arsenal
'football team' is the definition.
(I've seen this before)
'stadium housing second lima' is the wordplay.
'stadium' becomes 'arena' (synonyms).
'housing' is an insertion indicator.
'second' becomes 's' (common abbreviation).
'lima' becomes 'l' (phonetic alphabet: alpha, bravo, charlie etc.).
'arena' placed around 's' is 'arsena'.
'arsena'+'l'='ARSENAL'
(Other definitions for arsenal that I've seen before include "Highbury football team" , "Cache of weapons or English soccer team" , "Store of guns and ammunition" , "Collection of weapons" , "gunners, so-called" .)