Crossword Genius

Duties include turning up on trains (9)

Ross

I believe the answer is:

exercises

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

'duties include turning up on' is the wordplay.
'duties' becomes 'excises' (I can't explain this - if you can you should believe this answer much more).
'include' means one lot of letters goes inside another.
'turning up' is a reversal indicator.
'on' becomes 're' ('on' can be mean 'with reference to').
're' reversed gives 'er'.
'excises' going around 'er' is 'EXERCISES'.

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(Other definitions for exercises that I've seen before include "Muscle movements to promote fitness" , "Activities to develop a skill" , "Keep-fit activities" , "Works out" , "trains" .)

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