Two manuals included a female (5)
I believe the answer is:
woman
'a female' is the definition.
(I know that female can be written as woman)
'two manuals included' is the wordplay.
'included' indicates the answer is hidden within the clue (I've seen 'including' mean this).
'WOMAN' can be found hidden inside 'two manuals'.
(Other definitions for woman that I've seen before include "With 1a [NEW] a freedom fighter" , "Adult female" , "See 16" , "person not going on stag-night" , "With 1a [OLD], one's rather timid" .)