[11] He was sworn in on 5 July 1977 and as assistant minister he had to develop the process of decentralization of power prior to the constitution of 1978 and the promotion of preautonomy of the various regions and nationalities of Spain.

[11] At that time there were attempts to ensure that only the historic nationalities of Catalonia, the Basque Country and Galicia would have governments with full autonomy and their own parliaments, while the rest of the regions were to assume fewer ceded competencies, for example Andalusia.

"), a formula that allowed those underprivileged regions to assume autonomy in the same way as the historic nationalities,[15] because he did not accept that in Spain there were two different types of autonomous communities.

[16] Clavero had obstacles for this article to be added to the constitution, as Suárez was opposed and it was not well seen that Andalusia should have the same rank of self-government as Catalonia or the Basque Country, but finally it was included in its entirety.

[17] Manuel Clavero was named Minister of Culture in the first constitutional government under the leadership of Suárez and was sworn in on 6 April 1979.

[18] Under his leadership of the Ministry, in September 1979 RTVE's Bylaws were approved by which Spanish public television and radio became a more democratic system, controlled by the Congress of Deputies and, in particular, gave the Autonomous Communities the possibility of creating regional channels, since they could directly manage a state-owned television channel for the territorial scope of each Autonomous Community.

[19] In November of the same year he received in Barcelona the mortal remains of Pau Casals, who died in exile in 1973 and did not want to be buried in Spain until the return of democracy.