Actors on holiday finding shipwrecked person (8)
I believe the answer is:
castaway
'shipwrecked person' is the definition.
(I've seen this before)
'actors on holiday' is the wordplay.
'actors' becomes 'cast' (group of actors).
'on holiday' becomes 'away' (I've seen this before).
'cast'+'away'='CASTAWAY'
'finding' is the link.
(Other definitions for castaway that I've seen before include "Shipwrecked character" , "just one left on the Strand?" , "worthless" , "One stranded remotely" , "Someone stranded on a 12 island" .)