Crossword Genius

*Drive some toilet phrase (5)

Ross

I believe the answer is:

oomph

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

'drive' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for oomph that I've seen before include "drive" , "Dynamism" , "Ginger" , "Spirited vigour" , "Vitality, zing" .)

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