Eastern celebrity catching our cracking train (8)
I believe the answer is:
eurostar
'train' is the definition.
(I've seen this before)
'eastern celebrity catching our cracking' is the wordplay.
'eastern' becomes 'e'.
'celebrity' becomes 'star' (a star is a celebrity or famous person).
'catching' indicates putting letters inside.
'cracking' indicates anagramming the letters.
'e'+'star'='estar'
'our' is an anagram of 'uro'.
'estar' enclosing 'uro' is 'EUROSTAR'.
(Other definitions for eurostar that I've seen before include "cross-Channel express" , "Waterloo to Paris train" , "Railway service via the Channel Tunnel" , "International train" , "International traveller" .)