Members of family embracing good upper-class rules (11)

I believe the answer is:

regulations

'rules' is the definition.
('regulation' can be a synonym of 'rule')

'members of family embracing good upper-class' is the wordplay.
'members of family' becomes 'relations' (relatives).
'embracing' indicates putting letters inside.
'good' becomes 'g' (abbreviation).
'upper-class' becomes 'u' (similar in meaning).
'g'+'u'='gu'
'relations' placed around 'gu' is 'REGULATIONS'.

(Another definition for regulations that I've seen is " Directives possibly".)

I've seen this clue in The Times.

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