Crossword Genius

Duck's speed when stationary, demonstrating vitality? (5)

Ross

I believe the answer is:

oomph

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

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

'duck's speed when stationary' is the wordplay.
I cannot really see how this works, but
'speed' could be 'mph' (miles per hour) and 'mph' is found within the answer.
'duck' could be 'o' (resembles zero - 'duck' in cricket) and 'o' is found within the answer.
A single letter 'o' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'demonstrating' acts as a link.

Can you help me to learn more?

(Other definitions for oomph that I've seen before include "Ginger" , "Get-up-and-go" , "Spirited vigour" , "attractiveness" , "Shows excitement aplenty" .)

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