Seated, I get up and take off (8)
I believe the answer is:
satirise
'take off' is the definition.
(I've seen this before)
'seated i get up' is the wordplay.
'seated' becomes 'sat' ('sit' can be a synonym of 'seat').
'get up' becomes 'rise' (synonyms).
'sat'+'i'+'rise'='SATIRISE'
'and' is the link.
(Other definitions for satirise that I've seen before include "Ridicule with witty words" , "Send up" , "Criticise with a literary composition" , "take off" , "parody" .)