0-60 (min time for action!) (4,4)

I believe the answer is:

zero hour

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'time for action' is the definition.
(time when a military organisation begins)

'0-60 min' is the wordplay.
'0' becomes 'zero' (synonyms).
'60 min' becomes 'hour' (I am not sure about this - if you are sure you should believe this answer much more).
'zero'+'hour'='ZERO HOUR'

Can you help me to learn more?

(Other definitions for zero hour that I've seen before include "Time to begin military operation" , "Time to launch attack etc" , "when attack begins?" , "Time for launching" , "when operation is due to start" .)

I've seen this clue in The Independent.

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