Scrupulously within the rules, but not totally restrictive (6)

I believe the answer is:

strict

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'scrupulously within the rules' is the definition.
I can't judge whether this definition defines the answer.

'not totally restrictive' is the wordplay.
'not totally' indicates a hidden word (only some letters are used).
'STRICT' is hidden in the letters of 'restrictive'.

'but' is the link.

Can you help me to learn more?

(Other definitions for strict that I've seen before include "Demanding that rules are observed" , "Rigid or stern" , "Undeviating" , "Not lenient or indulgent" , "Observing rules very closely" .)

I've seen this clue in the Evening Standard.

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