Sentence:  One can even argue - though this is a delicate matter - that every justification existed for their returning the Public Lecture to the First Church , and so to suppress it , rather than let Parker <WSD>use</WSD> it as a sounding board for his propaganda when his turn should come to occupy it . 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose