Crossword Genius

Child stars travelling economy (5,5)

Ross

I believe the answer is:

third class

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'economy' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'child stars travelling' is the wordplay.
'travelling' indicates anagramming the letters.
'child'+'stars'='childstars'
'childstars' with letters rearranged gives 'THIRD-CLASS'.

Can you help me to learn more?

(Other definitions for third class that I've seen before include "Grade C" , "very poor" , "Low grade" , "kind of degree" , "modest level" .)

I've seen this clue in The Times and The Sunday Times.
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