Maiden held assistant (4)
I believe the answer is:
aide
'assistant' is the definition.
(aide is a kind of assistant)
'maiden held' is the wordplay.
'held' indicates a hidden word.
'AIDE' is hidden in the letters of 'maiden'.
(Other definitions for aide that I've seen before include "Personal assistant in the military" , "Helper" , "one helping" , "someone in assistance" , "Leader's assistant" .)