Rising poet is full of gravity but a bit theatrical (6)
I believe the answer is:
stagey
'a bit theatrical' is the definition.
'stagey' can be an answer for 'theatrical' (I've seen this in another clue). I am not certain of the 'a bit' bit.
'rising poet is full of gravity' is the wordplay.
'rising' says the letters should be written in reverse (in a down clue, letters go up).
'poet' becomes 'yeats' (Yeats is an example).
'is full of' indicates putting letters inside.
'gravity' becomes 'g'.
'yeats' enclosing 'g' is 'yegats'.
'yegats' reversed gives 'STAGEY'.
'but' is the link.
Can you help me to learn more?
(Other definitions for stagey that I've seen before include "may be exaggerated" , "Much too theatrical" , "Excessively dramatic" , "camp" .)