Computer language for one leaving school (7)

I believe the answer is:

fortran

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'computer language' is the definition.
(I've seen this before)

'for one leaving school' is the wordplay.
'one leaving school' becomes 'tran' (I can't justify this - if you can you should give a lot more credence to this answer).
'for'+'tran'='FORTRAN'

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(Other definitions for fortran that I've seen before include "computer language" , "programming language" , "Coded language" , "Language of PC" .)

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

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