Call in first pair of organists to play instrument in Cobh cathedral (8)

I believe the answer is:

carillon

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'call' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for carillon that I've seen before include "Set of bells playing melodies" , "Tune played from bell-tower" , "Set of musical bells" , "Stop" , "A set of bells sounded mechanically or from keyboard" .)

I've seen this clue in The Irish Times.

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