Good friends strike back (4)

I believe the answer is:

pals

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'good friends' is the definition.
'pals' can be an answer for 'friends' (pal is a kind of friend). I am unsure of the 'good' bit.

'strike back' is the wordplay.
'strike' becomes 'slap' (slapping is a kind of striking).
'back' is a reversal indicator.
'slap' in reverse letter order is 'PALS'.

Can you help me to learn more?

(Another definition for pals that I've seen is " Friends".)

I've seen this clue in the Sydney Morning Herald.

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