Book posh seats initially, engaging with chap in charge of play (5,10)
I believe the answer is:
titus andronicus
'play' is the definition.
(I've seen this before)
'book posh seats initially engaging with chap in charge' is the wordplay.
I cannot quite understand how this works, but
'book' could be 'titus' (the Epistle of Paul to Titus, a book of the Bible) and 'titus' is located in the answer.
'posh' could be 'u' (abbreviation for upper-class - opposite to non-U) and 'u' is located in the answer.
'with' could be 'and' and 'and' is present in the answer.
'chap' could be 'ron' (short for Ronald) and 'ron' is located in the answer.
'in charge' could be 'ic' (abbreviation for 'in charge') and 'ic' is present in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for titus andronicus that I've seen before include "Play about violent revenge" , "Shakespeare play" .)