Crossword Genius

Test no longer taking half a day (4)

Ross

I believe the answer is:

exam

I'm a little stuck... Click here to teach me more about this clue!

'test' is the definition.
(I know that test can be written as exam)

'no longer taking half a day' is the wordplay.
'no longer' becomes 'ex' (prefix meaning former or onetime).
'taking' says to put letters next to each other.
'half a day' becomes 'am' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ex'+'am'='EXAM'

Can you help me to learn more?

(Other definitions for exam that I've seen before include "Oral maybe" , "Written test" , "Something to sit" , "Important test" , "Student test" .)

I've seen this clue in the Evening Standard.
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