Crossword Genius

Large containers a lad stowed in vehicles (7)

Ross

I believe the answer is:

carboys

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

'large containers a lad' is the definition.
I can't tell whether this defines the answer.

'stowed in vehicles' is the wordplay.
'stowed' becomes 'boy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'vehicles' becomes 'cars' (car is a kind of vehicle).
'boy' placed within 'cars' is 'CARBOYS'.

Can you help me to learn more?

(Another definition for carboys that I've seen is " Means to carry corrosive".)

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