Notable partygoer brought back aboard oil rig tipsy (2,4)
I believe the answer is:
it girl
'notable partygoer' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'back aboard oil rig tipsy' is the wordplay.
'back' is a reversal indicator.
'aboard' says the answer is hidden in the clue (the answer is aboard or within the clue).
'lrigti' is hidden within 'oil rig tipsy'.
'lrigti' reversed gives 'IT GIRL'.
'brought' is the link.
Can you help me to learn more?
(Other definitions for it girl that I've seen before include "Socialite" , "lass with lots of oomph" , "Highly-attractive young woman" .)