Blissful in rave after receiving a shot in the arm? On the contrary (7)
I believe the answer is:
radiant
'blissful' is the definition.
(thesaurus)
'rave after receiving a shot in the arm? on the contrary' is the wordplay.
'rave' becomes 'rant' (synonyms).
'after receiving' means one lot of letters goes inside another.
'a shot in the arm?' becomes 'aid' (I can't justify this - if you can you should believe this answer much more).
'on the contrary' is a reversal indicator (letters in the opposite or contrary direction).
'aid' reversed gives 'dia'.
'rant' placed around 'dia' is 'RADIANT'.
'in' is the link.
Can you help me to learn more?
(Other definitions for radiant that I've seen before include "with good humour" , "Very rich (7.2.2)" , "Luminous" , "Straight line" , "Effulgent" .)