Bribe reserve, otherwise last in pavilion (6)
I believe the answer is:
suborn
'bribe' is the definition.
(thesaurus)
'reserve otherwise last in pavilion' is the wordplay.
'reserve' becomes 'sub' (I've seen this in other clues).
'otherwise' becomes 'or'.
'last in' suggests the final letters.
The final letter of 'pavilion' is 'n'.
'sub'+'or'+'n'='SUBORN'
(Other definitions for suborn that I've seen before include "Bribe (someone) to commit perjury" , "Bribe for evil intent" , "Induce someone to commit a crime" , "Bribe for evil ends" , "Induce (someone) to break the law" .)