Gathering to consume drug? Honestly! (6)
I believe the answer is:
really
'honestly' is the definition.
(I've seen this before)
'gathering to consume drug?' is the wordplay.
I cannot really understand how this works, but
'drug?' could be 'e' (E is another name for ecstasy) and 'e' is located in the answer.
'gathering' could be 'rally' (rally is a kind of gathering) and 'rally' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for really that I've seen before include "Go on" , "Do you mean it?" , "Truly, in fact" , "Actually, honest to God" , "Actually, in fact" .)