A short film full of energy (4)

I believe the answer is:

avid

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

'a short film full of energy' is the definition.
I can't tell whether this defines the answer.

'a short film' is the wordplay.
'short film' becomes 'vid' (short for video).
'a'+'vid'='AVID'

Can you help me to learn more?

(Other definitions for avid that I've seen before include "Keen, enthusiastic" , "Excessively keen" , "Fanatical" , "Very keen, desirous" , "Keen or greedy" .)

I've seen this clue in The Guardian.

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