Concentrated in time for a grammar lesson (7)

I believe the answer is:

intense

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'concentrated' is the definition.
(similar in meaning)

'in time for a grammar lesson' is the wordplay.
'time for' becomes 't' (I've seen this in other clues).
'a grammar lesson' becomes 'ense' (I can't explain this - if you can you should believe this answer much more).
'in'+'t'+'ense'='INTENSE'

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(Other definitions for intense that I've seen before include "Teen sin (anag.)" , "Highly emotional" , "Forceful, concentrated" , "Showing strong feelings or opinions" , "Powerful" .)

I've seen this clue in The Globe and Mail.

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