Final answer:
The autoclitic function of the rearranged words 'had we but world enough and time' is to emphasize the rhetorical effect by altering the conventional word order, creating a poetic quality.
Step-by-step explanation:
The autoclitic function of the phrase 'had we but world enough and time, we could go through the proper motions' is to emphasize the rhetorical effect. This inversion of the usual word order draws attention to the hypothetical nature of the statement, adding emphasis and creating a poetic or rhetorical quality. Writers often manipulate syntax, or the order of words in a sentence, in order to achieve such an effect, challenging conventional expectations in rhetorically effective ways. This practice can be seen in classical literature, such as the works of Shakespeare, and is used by poets to highlight certain aspects of their message or to add stylistic flair to their writing.