Crossword Genius

Captain misses lessons (7)

Ross

I believe the answer is:

classes

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

'lessons' is the definition.
(as in school classes)

'captain misses' is the wordplay.
'captain' becomes 'c' (this might be a standard abbreviation which I don't know about).
'misses' becomes 'lasses' (lass is a kind of miss).
'c'+'lasses'='CLASSES'

Can you help me to learn more?

(Other definitions for classes that I've seen before include "See 1" , "Groups with the same social or economic status" , "Categories" .)

I've seen this clue in the Sydney Morning Herald.
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