Get up right after part of flight (5)
I believe the answer is:
riser
'part of flight' is the definition.
(I've seen this before)
'get up right after' is the wordplay.
'get up' becomes 'rise' (synonyms).
'right' becomes 'r' (abbreviation).
'after' is a charade indicator (letters next to each other).
'rise'+'r'='RISER'
(Other definitions for riser that I've seen before include "Section of flight" , "Vertical upward pipe" , "A bit of a flight" , "Vertical pipe in a building" , "He gets up" .)