Greek girl drops ecstasy into swirling claret (7)
I believe the answer is:
electra
'greek' is the definition.
(I know that Electra is a greek)
'ecstasy into swirling claret' is the wordplay.
'ecstasy' becomes 'E' (informal term for the drug).
'into' means one lot of letters goes inside another.
'swirling' indicates anagramming the letters.
'claret' is an anagram of 'elctra'.
'e' put within 'elctra' is 'ELECTRA'.
'girl drops' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for electra that I've seen before include "Complex parallel to Oedipus" , "Greek tragedy" , "titled lady" , "Complex girl" , "Sort of complex" .)