Saint taking on new and unexciting line of work (10)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

PETER (a saint), containing (taking on) N (abbreviation for new) + TAME (unexciting). A line of a work written in verse with a rhythm of five syllable groups to a line, such as most of Shakespeare’s output which is written in iambic pentameter.