It requires fellow players giving support to hold back dangerous stuff (4,4)
I believe the answer is:
team game
'it requires fellow players' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'support to hold back dangerous stuff' is the wordplay.
'support' becomes 'tee' (tee is a kind of support).
'to hold' means one lot of letters goes inside another.
'back' shows that the letters should be reversed in order.
'dangerous stuff' becomes 'magma' (magma is a kind of stuff. I am not sure about the 'dangerous' bit.).
'magma' back-to-front is 'amgam'.
'tee' placed around 'amgam' is 'TEAM GAME'.
'giving' acts as a link.
Can you help me to learn more?