Rugby side required to score 147? (3,6)

I believe the answer is:

all blacks

I'm a little stuck... Click here to teach me more about this clue!

'rugby side' is the definition.
'all blacks' can be an answer for 'side' (I've seen this before). I am not sure about the 'rugby' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for all blacks that I've seen before include "as needed for optimal break" , "The New Zealand national rugby team" , "High-scoring fifteen" , "NZ Rugby team" , "New Zealand rugby team, very sombre" .)

I've seen this clue in The Guardian.

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