Get up close to one, not early! (5)
I believe the answer is:
elate
'get up' is the definition.
'close to one not early' is the wordplay.
'close to' says to take the final letters (the close/ending of).
'not early' becomes 'late' ('late' is the opposite to 'early').
The final letter of 'one' is 'e'.
'e'+'late'='ELATE'
(Other definitions for elate that I've seen before include "Doctor suitor to Anne Page (MWOW)" , "Fill with joy" , "Make joyful and proud" , "Make happy or joyful" , "Bring joy" .)