Item from Biblical book son held in part of hand (5)
I believe the answer is:
psalm
'item from biblical book' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?
'son held in part of hand' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'held in' indicates putting letters inside.
'part of hand' becomes 'palm' ('palm' is part of 'hand').
's' placed within 'palm' is 'PSALM'.
Can you help me to learn more?
(Other definitions for psalm that I've seen before include "Devotional hymn or song" , "Sacred poem attributed to David" , "Song - hymn - prayer" , "Religious song" , "Sacred song or hymn" .)