Fair shot at intervals? Quite true (4,2)

I believe the answer is:

just so

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'quite true' is the definition.
Both the answer and definition are adverbs. Perhaps you can see an association between them that I don't see?

'fair shot at intervals?' is the wordplay.
'fair' becomes 'just' (Synonym).
'at intervals?' indicates alternate letters (I've seen 'at intervals' mean this (letters are taken at regular intervals)).
The alternating letters of 'shot' are 'so'.
'just'+'so'='JUST SO'

Can you help me to learn more?

(Other definitions for just so that I've seen before include "In a precise manner" , "Like Kipling's stories" , "Carefully arranged" , "how some stories were described" , "Exactly as you say" .)

I've seen this clue in The Telegraph.

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