Helen & Co adjusted level (7)
I believe the answer is:
echelon
'level' is the definition.
(I've seen this before)
'helen co adjusted' is the wordplay.
'adjusted' is an anagram indicator.
'helen'+'co'='helenco'
'helenco' with letters rearranged gives 'ECHELON'.
(Other definitions for echelon that I've seen before include "Level in hierarchy" , "Level of people in organisation" , "Grade or level" , "Echo Len (anag.)" , "Level of command" .)