Theatrical warning to Scottish clan? (8)
I believe the answer is:
campbell
'scottish clan?' is the definition.
(Clan Campbell, a Highland clan)
'theatrical warning' is the wordplay.
'theatrical' becomes 'camp' (I've seen this before).
'warning' becomes 'bell' (a bell might be used as a warning).
'camp'+'bell'='CAMPBELL'
'to' is the link.
(Other definitions for campbell that I've seen before include "Donald --, died in 1967 on Coniston Water" , "Donald of "Bluebird" fame - Sol of Arsenal fame" , "Malcolm --, who was killed in his boat Bluebird on Coniston Water" , "Old clan" .)