Resorts to finishing a film in a quick burst (5)

I believe the answer is:

spasm

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'quick burst' is the definition.
'spasm' can be an answer for 'burst' (I've seen this in another clue). I am not sure about the 'quick' bit.

'resorts to finishing a film' is the wordplay.
'resorts' becomes 'spas' (spa is a kind of resort).
'to finishing' says to take the final letters (the letter which finishes the word).
The last letter of 'film' is 'm'.
'spas'+'m'='SPASM'

'in a' is the link.

Can you help me to learn more?

(Other definitions for spasm that I've seen before include "Involuntary muscular contraction" , "Convulsive action" , "Tic, sudden contraction" , "Pretend to have (injury)" , "Muscular convulsion" .)

I've seen this clue in the Evening Standard.

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