Testament, word of introduction for play (7)
I believe the answer is:
othello
'for play' is the definition.
(play by William Shakespeare)
'testament word' is the wordplay.
'testament' becomes 'ot'.
'word' becomes 'hello' (I have seen 'Word of greeting' mean 'hello' so perhaps 'word' could also mean 'hello').
'ot'+'hello'='OTHELLO'
'of introduction' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for othello that I've seen before include "Eponymous hero" , "Shakespeare's general" , "Shakespearean Moor" , "Shakespearean hero" , "game with counters" .)