In the dictionary, a word meaning 'ruling' (5)

I believe the answer is:

edict

'ruling' is the definition.
(I have seen 'Authoritative ruling ' mean 'edict' so perhaps 'ruling' could also mean 'edict')

'in the dictionary a word' is the wordplay.
'in' says the answer is hidden in the clue.
'EDICT' is hidden within 'the dictionary word'.

'meaning' is the link.

(Other definitions for edict that I've seen before include "Formal order" , "Authoritative decree" , "Formal proclamation" , "Legally binding proclamation" , "Decree, order" .)

I've seen this clue in the Evening Standard.

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