Exercise books on American tree rewritten as part of 18's work? (10)
I believe the answer is:
Here is my best explanation:
'part of 18's work?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'exercise books on american tree rewritten' is the wordplay.
'exercise' becomes 'pe' (Physical Education).
'books' becomes 'nt' (New Testament).
'on american' becomes 'am' (abbreviation in some contexts. I am not sure about the 'on' bit.**).
'rewritten' indicates anagramming the letters.
'tree' is an anagram of 'eter'.
'as' acts as a link.
(Other definitions for pentameter that I've seen before include "line of verse", "Line of five metric feet", "Verse line of 20 ac feet", "Friar Laurence's usual line" and "Typical Shakespearean line".)