No, there is no verb "acre". In this case "acres" acts as a modifier for the adjective "wide", describing the (large) degree to which the slums are wide. ) Similar phrases would be "miles deep" or "metres long".
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SweetFreedomDoes "acre" in "acres wide" act as a verb?No. The verb was omitted in both parenthetical small clauses after the subject "hideous slums".