Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
conclāmātĭo, ōnis, f. [conclamo], a loud shouting or calling of many persons together, a shout (rare; not in Cic.): universi exercitūs, Caes. B. C. 2, 26: tot milium sub gladio gementium, Sen. Clem. 1, 12, 2; in plur., Tac. A. 3, 2; id. H. 4, 1.