In Brazil first team's jerseys, socks and shorts worn by The Boys in Blue in case the crowd mob them (4,4)
I believe the answer is:
riot gear
'shorts worn by the boys in blue in case the crowd mob them' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'in brazil first team's jerseys socks' is the wordplay.
'in brazil' becomes 'rio' ('Rio' is part of 'brazil').
'first' indicates taking the first letters.
'jerseys socks' becomes 'gear' (I can't explain this - if you can you should give a lot more credence to this answer).
The initial letter of 'teams' is 't'.
'rio'+'t'+'gear'='RIOT GEAR'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for riot gear that I've seen before include "Clobber with truncheon maybe" , "What police use to control" , "It's worn by police" , "protective clothing" .)