Fa-la linkup (3)
I believe the answer is:
sol
'fa-la linkup' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sol that I've seen before include "A Latin sun" , "Note; Peruvian currency" , "Fifth note of scale" , "Roman counterpart of Helios" , "The sun in Spain" .)