Studies something written on a wrecked car (5)

I believe the answer is:

crams

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'studies' is the definition.
(cramming is a kind of studying)

'something written on a wrecked car' is the wordplay.
'something' becomes 'ms' (I can't explain this - if you can you should believe this answer much more).
'written on' is a charade indicator (letters next to each other).
'a wrecked' indicates anagramming the letters.
'car' is an anagram of 'cra'.
'ms' put after 'cra' is 'CRAMS'.

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I've seen this clue in the Evening Standard.

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