Irrepressible, I get right in among the others (9)
I believe the answer is:
resilient
'irrepressible' is the definition.
(I've seen this before)
'i get right in among the others' is the wordplay.
'get' is a charade indicator (letters next to each other).
'right' becomes 'lien' (legal right).
'in among' is an insertion indicator.
'the others' becomes 'rest' (eg the rest of a group).
'i'+'lien'='ilien'
'ilien' put within 'rest' is 'RESILIENT'.
(Other definitions for resilient that I've seen before include "Elastic" , "able to withstand disappointment" , "Bouncy" , "Able to recover quickly" , "recovering easily from shock" .)