The moment has arrived where winger tackles relative after greeting (4,2,2)

'the moment has arrived' is the definition.
(phrase said at a significant moment)

'winger tackles relative after greeting' is the wordplay.
I cannot really see how this works, but
'relative' could be 'sis' (short for sister) and 'sis' is found in the answer.
'greeting' could be 'hi' (hi is a kind of greeting) and 'hi' is found within the answer.
'winger' could be 'tit' (tit is a kind of bird) and 'tit' is present in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).

'where' is the link.