Seek an engagement - or work in plain language (7)
I believe the answer is:
propose
'seek an engagement' is the definition.
I can't tell whether this definition defines the answer.
'work in plain language' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'in' indicates putting letters inside.
'plain language' becomes 'prose' (I've seen this in another clue).
'op' going inside 'prose' is 'PROPOSE'.
'or' is the link.
Can you help me to learn more?
(Other definitions for propose that I've seen before include "table" , "Put forward for consideration" , "Put forward a plan" , "Put forward (an idea)" , "Tender" .)