TNT is explosive, so be very careful! (5)

I believe the answer is:

stint

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'be very careful' is the definition.
I can't judge whether this definition defines the answer.

'tnt is explosive' is the wordplay.
'explosive' is an anagram indicator.
'tnt'+'is'='tntis'
'tntis' with letters rearranged gives 'STINT'.

'so' acts as a link.

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(Other definitions for stint that I've seen before include "Supply inadequately - fixed period of work" , "Allotted period (of work)" , "Spot of work" , "Stretch of work" , "Assignment" .)

I've seen this clue in the Evening Standard.

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