Soldiers, crook and even rogue meet again (9)
I believe the answer is:
reconvene
'meet again' is the definition.
('convene' is an answer for 'meet' so perhaps 'reconvene' is OK for 'meet again')
'soldiers crook and even rogue' is the wordplay.
'soldiers' becomes 're' (Royal Engineers).
'crook' becomes 'con'.
'and' means one lot of letters go next to another.
'rogue' indicates an anagram (letters go rogue).
'even' anagrammed gives 'vene'.
're'+'con'+'vene'='RECONVENE'
(Other definitions for reconvene that I've seen before include "get together again" , "Meet again" .)