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(1) Clue = Study,say 4 letters = R ? W ?

The 'R' is the fifth letter of a 7 letter word with clue=
Full of self importance = 3,4 = ego tRip

The 'W' is fifth letter of a 9 letter word with clue =
Study of our origins = Strawpoll

(2A) Oil Rich Land = ? A ? ? ? G ?
(2B)Pertaining to a position = T ? T ? ? ? E
Fourth letter of (2A) is the same as the fifth letter of (2B)

Any help on above really appreciated.

Study of our origins looks more like "genealogy"

(2B)Pertaining to a position could be "titular"

Ego trip doesn't seem to make sense if the entire clue is as given above.

ethnology?
room?