Occasionally, best Scottish island turned up in report (7)
I believe the answer is:
narrate
'report' is the definition.
(I've seen this before)
'occasionally best scottish island turned up' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'scottish island' becomes 'arran' (island off the coast of Scotland).
'turned up' is a reversal indicator.
The alternating letters of 'best' are 'et'.
'et'+'arran'='etarran'
'etarran' in reverse letter order is 'NARRATE'.
'in' is the link.
(Other definitions for narrate that I've seen before include "Relate - portray" , "Tell story,recount" , "tell tales" , "Set forth" , "Tell a story, recite" .)