Currier's partner (4)
I believe the answer is:
ives
'currier's partner' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ives that I've seen before include "American composer of Three Places in New England, d. 1954" , "This classical composer" , "Saint of Cornwall or Cambridgeshire" , "St -, Cornish resort" , "Charles -, American composer (The Unanswered Question)" .)