Crossword Genius

Second-class in tube train leaving Turin (4)

Ross

I believe the answer is:

beta

'second-class' is the definition.
(one less than alpha)

'tube train leaving turin' is the wordplay.
'leaving' suggests deleting specific letters.
'tube'+'train'='tubetrain'
'tubetrain' with 'turin' removed is 'BETA'.

'in' is the link.

(Other definitions for beta that I've seen before include "second class grade?" , "less than perfect mark" , "Old character" , "Second Greek letter - beat that" , "Greek letter -- second in order of importance" .)

I've seen this clue in The Telegraph.
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