Mystical text putting worker in trance? Not half (6)
I believe the answer is:
tantra
'mystical text' is the definition.
(I've seen this before)
'worker in trance? not half' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'in' indicates putting letters inside.
'not half' indicates taking half.
'trance' halved is 'tra'.
'ant' put inside 'tra' is 'TANTRA'.
'putting' is the link.
(Other definitions for tantra that I've seen before include "Sacred books" , "Magic text" , "Religious text" , "mystical writing" , "religious work" .)