Feel like going in drag to such a party? (5,5)
I believe the answer is:
fancy dress
'drag to such a party?' is the definition.
I can't tell whether this defines the answer.
'feel like going' is the wordplay.
'feel like' becomes 'fancy' (feel like can mean to desire or fancy something).
'going' becomes 'dress' (I can't explain this - if you can you should believe this answer much more).
'fancy'+'dress'='FANCY DRESS'
'in' is the link.
Can you help me to learn more?
(Other definitions for fancy dress that I've seen before include "Frivolous party garb" , "Themed party attire" , "Masquerade costume?" , "Party costume" .)