A drink knocked back, one guzzled in the Crown and Sceptre, say? (7)
I believe the answer is:
regalia
'the crown and sceptre say?' is the definition.
I can't tell whether this defines the answer.
'a drink knocked back one guzzled' is the wordplay.
'drink' becomes 'lager' (lager is a kind of drink).
'knocked back' says the letters should be written in reverse.
'one' becomes 'i' (Roman numeral).
'guzzled' indicates putting letters inside (inserted letters get guzzled up).
'a'+'lager'='alager'
'alager' back-to-front is 'regala'.
'regala' going around 'i' is 'REGALIA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for regalia that I've seen before include "Trappings of royalty" , "Paraphernalia indicative of high office" , "Array" , "Crown jewels" , "Royal items" .)