Crossword Genius

Straight students primarily drink pop (4-4)

Ross

I believe the answer is:

slap-bang

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

'straight' is the definition.
Both the definition and answer are adverbs. Perhaps they are linked in a way I don't understand?

'students primarily drink pop' is the wordplay.
'primarily' says to take the initial letters.
'drink' becomes 'lap' (to lap is to drink up).
'pop' becomes 'bang' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'students' is 's'.
's'+'lap'+'bang'='SLAP-BANG'

Can you help me to learn more?

(Other definitions for slap-bang that I've seen before include "Suddenly - directly" , "All at once - violently" , "right?" , "Absolutely (in the middle)" .)

I've seen this clue in The Telegraph.
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